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A and B both go from a to B at the same time. A's walking speed is 4 km / h, B's cycling speed is 12 km / h, B arrives one hour earlier than a, B How far is it from the ground?
Suppose AB is x, then the time from a to the destination is (x / 4), and the time from B to the destination is (x / 12)
The time of B is one hour less than that of a, so (x / 4) - (x / 12) = 1, and the solution is x = 6 km
A starts from a and walks to B at a speed of 5 km / h. After 1 hour and 12 minutes, B starts from a and chases a by bike. In order to catch up with a within 30 minutes, what's the minimum speed of B,
Simple! When B starts, a has already walked 5 x 1.2 = 6 km. After 30 minutes, that is 0.5 hours, a has walked 5 x 0.5 = 2.5 km. In this way, if B just catches up with a in 30 minutes, then the distance of a and B is 6 + 2.5 = 8.5 km. In other words, B should walk 8.5 km at least in 30 minutes
A and B both rode bicycles from a and B at the same time. It is known that a's speed is twice that of B's, less than 3 km / h. two hours later, the distance between them is 12 km / h
If the distance between them is the same after another two hours, the speed of a and B and the distance between a and B can be calculated
Suppose B's speed is x km / h, then a's speed is (2x-3) km / h. After 2 hours, the distance between two people is 12, then AB's distance is: A's journey plus B's journey plus 12 km, 2x + 2 (2x-3) + 12. After another 2 hours, two people are still at the same distance. A's journey + B's journey - 2 * 12 = AB's 2x + 2 (2x-3) + 12 = 4x +
Practice: Party A and Party B set out at the same time in AB, which is 12 kilometers away, and walk in the same direction. Party A walks 4 kilometers per hour, and the car is behind. The speed per hour is three times that of Party A. can party B catch up with Party A in a few hours?
A: it takes 1.5 hours for B to catch up with a
RELATED INFORMATIONS
- 1. Party A and Party B travel from two places 27 kilometers apart and meet two hours later. If it is known that Party B's speed is 5.5 km / h faster than Party A's speed, then Party B's speed is____ Km / h
- 2. A and B set out from ab at the same time. A rode a bicycle and B rode a motorcycle. They drove along the same road at an average speed. It is known that their speed ratio is 2:5 Meet 10.5 meters from the midpoint 1. How many meters is the distance between a and B? 2. If B arrives at a after 21 minutes, find the speed of a and B
- 3. The speed of a's bicycle is AKM per hour, which is twice as fast as that of a's, but less than 3 per hour. When B meets a half an hour later, how many kilometers are there between a and B
- 4. A. The distance between B and a is 20 kilometers. A and B walk from a to B. A walks 4 kilometers per hour. B rides a bicycle at 2.5 times the speed of A. a walks for an hour first, and B sets out. When B catches up with a, he immediately returns to a, then returns to a, and when B catches up with a, he immediately returns to a, and then returns to a, How many kilometers did B walk?
- 5. A and B are 10 kilometers apart. Now they are going to each other at the speed of 3 km / h and 2 km / h respectively. At the same time, a dog runs from a to B at the speed of 10 km / h. After meeting B, it immediately turns around and runs to a, and then runs to B after meeting a Until Party A and Party B meet, ask for the distance that the dog takes
- 6. A. The distance between two places B is 20km. A advances from a to B, while B advances from B to A. two hours later, they meet on the way. After meeting, a returns to a, and B still advances to A. when a returns to a, B is 2km away from A. find out the speed of a and B
- 7. AB is 100km away, a is 20km / h in place a, B is 30km / h in place B, a starts one hour later, B starts two people contrary to each other, B starts several hours, two people are 200km away
- 8. A and B two cars simultaneously from AB two opposite, 6 hours meet, after meeting a car continue to drive 4 hours to arrive at B, B line to complete the whole how many hours?
- 9. A and B two people ride bicycles from AB to each other at the same time. It takes 6 hours for a to complete the whole journey. When a and B meet, the distance is 3:2, and a is better than B when they meet How many kilometers per hour for B
- 10. In AB, the ratio of time for a and B to complete the whole journey by bicycle is 4:5. If a and B travel from ab at the same time, 40 minutes later, they meet and continue to move forward. In this way, how many minutes later will b arrive at a than a arrive at B?
- 11. The speed of a and B is 17.5km/h and that of B is 15km / h When the distance is 32.5Km, what is the riding time for two people?
- 12. The speed of a is 17.5km/h, the speed of B is 15km / h, when the distance is 32.5km/h The speed of a and B is 17.5km/h and 15km/h respectively. When the distance between them is 32.5, what is their cycling time?
- 13. A. B. two people ride bicycles from two places 65km apart at the same time. Two hours later, the distance is 25km. A rides 2.5km more than B Two people ride bicycles from two places 65km apart at the same time. Two hours later, the distance is 25km. A rides 2.5km more than B per hour. Suppose B travels x km per hour, then a travels -------- km per hour. According to the meaning of the question, the equation is----------------
- 14. Xiao Wang rode a bicycle and Xiao Li rode a motorcycle. At the same time, they set out from two places 100km away, facing each other. After meeting each other on the way, they continued to move forward, turned their backs and started at the same time In the last three hours, they were 314km apart. Xiao Wang traveled 14km per hour, and Xiao Li how many km per hour?
- 15. A and B teams of students set out from two places 18 kilometers apart at the same time and walk in opposite directions Team a travels 5 kilometers per hour and team B travels 4 kilometers per hour. When the two teams meet, how many kilometers do the cyclists travel?
- 16. Two hours later, they are 36 kilometers apart, and two hours later, they are still 36 kilometers apart Note: it's a system of linear equations with two variables!
- 17. The speed of a is 12 kilometers per hour, the speed of B is 15 kilometers per hour, and the speed of a is middle
- 18. Party A and Party B ride from a and B to each other. It is known that the speed ratio of Party A and Party B is 2:3. Party A starts 15 minutes earlier than Party B. after 1 hour and 45 minutes, they meet Party B. at this time, Party A walks 6 kilometers less than Party B. find out the speed of Party A and Party B and the distance between two places
- 19. The distance between a and B is 60 kilometers. A and B ride bicycles from a and B to each other. If a starts half an hour earlier than B, B travels 2000 more per hour than a M. then when they meet, the distance they travel is exactly the same. Find the speed of a and B. don't use fractions, just make a binary linear equation system
- 20. Party A and Party B start from A. B at the same time, and Party A rides a bicycle Party A and Party B set out from A.B. at the same time. Party A rode a bicycle and Party B rode a motorcycle. They drove at a constant speed along the same route. After three hours of departure, they met. It is known that Party B traveled 90 meters more than party a when they met again. After one hour of meeting, Party B arrived at place A. they asked what the speed of Party A and Party B was and how to solve the equation