Party A and Party B set out at the same time from a and B, 180 kilometers apart. Party A rides a bicycle and Party B drives a car. They drive evenly along the same route 15 km / h, B's speed is 45 km / h. how long does it take for them to meet? How long does it take for B to reach a?

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• 1. Car a and car B leave from a and B respectively. Car a travels 1.5 times as much as car B every hour. Three hours later, the two cars meet. At this time, car a exceeds 45 kilometers from the midpoint. How many kilometers does car a and car B travel per hour?
• 2. The two cars a and B leave 324km apart at the same time, and they meet on the way after 6 hours. The speed ratio of the two cars is 4:5 to find the speed of car a
• 3. A car from a to B, 50 kilometers per hour. 4 / 5 hours. If the speed is reduced by 20%, how many hours can it reach? emergency
• 4. Two cars a and B are going from a and B to each other at different speeds. They meet on the way, and the meeting place is 70km away from A. after meeting, the two cars continue to advance at the original speed, return immediately after reaching the destination, and meet again on the way. At this time, the meeting place is 50km away from A. It is known that the time from the first meeting to the second meeting is 4 hours, so the speed of two cars AB is calculated Who's going to help you list the equations
• 5. The original tonnage ratio of a and B piles of coal is 5:3. If 90 tons are transported from a pile to B pile, then the tonnage of the two piles is equal. How many tons are there in a and B piles?
• 6. Why are the carrying capacity of those minivans not integer, such as 0.99t
• 7. The ratio of walking speed between a and B is 7:5. A and B start from a and B at the same time. If they go in opposite directions, they will meet in 0.5 hours. If they go in the same direction, how long will it take for a to catch up with B?
• 8. Indefinite integral of negative LNX power of e
• 9. What is the indefinite integral of [LNX squared / x]
• 10. The square x (1 + LNX) DX of indefinite integral x=
• 11. The speed ratio of a and B is known to be 3:4. A starts 15 minutes earlier than B. after 1 hour and 45 minutes, a encounters B. at this time, a walks 6 kilometers less than B. how about the speed of a and B's car and the distance between AB and B?
• 12. A freight car and a passenger car set out from a and B at the same time. Four hours later, they met. The distance of freight car is 50 kilometers more than one third of the whole journey, and that of passenger car is 40 kilometers more than half of the whole journey. How many kilometers are there between a and B?
• 13. A group of scores 1 / 3, 1 / 2, 5 / 9, 7 / 12, 11 / 18 are arranged according to some rules. What is the 100th score?
• 14. A desk has five drawers. Each drawer is 55cm long, 45cm wide and 7cm deep. How many square meters of wood do you need to make this desk drawer? The number obtained keeps the whole number
• 15. Chickens and rabbits are in the same cage. There are 15 more chickens than rabbits. Chickens and rabbits have 132 feet. How many chickens and rabbits are there?
• 16. The square meter formula b * b = 15.30 B =? Tell me how much B equals and what formula is used to calculate it
• 17. One is a multiple of 8 and the other is a factor of 72. What is this number? What is it
• 18. 3. If 20 cases of apples are transported by each truck, how many times will the remaining 1080 cases of apples be transported by 3 trucks? (480 cases of apples are transported by 3 trucks in total) will be listed as a comprehensive formula (similar to the off formula calculation)
• 19. For a batch of goods, car a will transport it in 18 hours, car B will transport 1 / 3 of the goods in 8 hours, if car a will transport it in 10 hours first, How many hours will it take for B to transport the rest?
• 20. Negative even number, positive odd number, negative odd number are expressed by description