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The speed of an object moving in a uniform straight line is 108 kilometers per second. What is the distance of the object in 20 minutes? When it is 1800 meters, how long does it take
It takes one minute to walk 36 kilometers and 1800 meters in 20 minutes
The distance is 3 meters and the time is 4 minutes,
Distance divided by time equals speed
When someone goes back and forth between a and B, he first walks 2km, then takes 10km by car. When he comes back, he rides a bicycle. It takes just the same time to come and go. It is known that the car walks 16km more than the person per hour, and the person rides a bicycle 8km more than the person per hour. What is the walking speed of the person?
Suppose the walking speed of the person is XKM / h, then the speed of the bicycle is (x + 8) km / h, and the speed of the car is (x + 16) km / h. according to the meaning of the problem, the equation can be formulated: 12x + 8 = 2x + 10x + 16. The solution is: x = 4. The test shows that x = 4 is the solution of the original equation. A: the walking speed of the person is 4km / h
A bus runs every 5 minutes and arrives at a station on time. The probability of anyone waiting less than 3 minutes at the station is calculated
From the meaning of the question, we know that the question is a geometric type. All the events included in the test are that the bus arrives at a station in 5 minutes on time, and the time length is 5. The event that meets the condition is that the time length for anyone to wait at the station for less than 3 minutes is 3. From the geometric type probability formula, we get P = 35, so the answer is: 35
RELATED INFORMATIONS
- 1. If the train between a and B stops at three stations, there will be______ Different fares (same round-trip fare) need to be prepared______ I want to buy a ticket
- 2. If the train between a and B stops at three stations, there will be______ Different fares (same round-trip fare) need to be prepared______ I want to buy a ticket
- 3. How many different fares are there for a passenger train between a and B stopping at two stations
- 4. How many different fares are there? How many kinds of tickets do you need to prepare?
- 5. If the train between a and B stops at three stations, there will be______ Different fares (same round-trip fare) need to be prepared______ I want to buy a ticket
- 6. From a to B, it took 6 hours to go and 111 hours to return A. 211B. 50%C. 12D. 111
- 7. When someone walks from a to B, there are regular buses between a and B, and the departure intervals between the two places are equal. He finds that a bus to a comes every 6 minutes, and a bus to B comes every 12 minutes. How many minutes does the bus leave from their respective departure station?
- 8. When a bus arrives at a station, 4 / 7 of all passengers get off and 33 passengers come up. At this time, the number of passengers on the bus is 5 / 6 of the original number. How many passengers are there?
- 9. A and B leave from station AB at the same time. For the first time, they meet at 90km away from station A. after meeting, they continue to drive at the same speed and return to each other's place of departure immediately. For the second time, they meet at 50km away from station a to find the distance between two places
- 10. Li Wei rides a motorcycle from home to the railway station. If he travels 30 kilometers per hour, he will be 15 minutes earlier than the train. If he travels 18 kilometers per hour, he will be 15 minutes later than the train's departure time. If Li Wei plans to arrive at the railway station 10 minutes before the train leaves, what's the speed of his motorcycle at this time?
- 11. How to breathe in 1000m running? What should you do in 1000m running? Make it easy to run
- 12. Xiao Ming climbs up a high mountain and walks 4 kilometers an hour up the mountain and 6 kilometers an hour down the mountain to find the average speed up and down the mountain Walking 4 kilometers an hour up the mountain and 6 kilometers an hour down the mountain is the way back up the mountain
- 13. The following charts are 10 data extracted from the results of boys' 1000m running and girls' 800m running Boys No.1 and No.10 start running around the 400 meter track in the same direction at the same time. Can they meet for the first time in the 1000 meter run? If they can, find out the time required; if they can't, explain the reason. (boys No.1 score 3'10, boys No.10 score 3'55) Suppose that after X minutes, No. 1 and No. 10 can meet for the first time in the 1000 meter race 1000 /(35/ 60) x-1000 /3(55/ 60) x=400 ∴300x=1739 ∴x≈5.8 5 ′ 48 ″ > 3 ′ 05 ″, Candidates 1 and 10 cannot meet for the first time in the 1000 meter race In the process of solving this problem, why 1000 / (35 / 60) x-1000 / 3 (55 / 60) x = 400, x = 400? How did it come from?
- 14. A train from a to B, two hours 120 kilometers, with the same speed, from B to C 720 kilometers, in () hours? ①12 ②11 ③10
- 15. The speed ratio of the express train to the local train is 5:3. It takes 12 hours for the express train to leave from place a to place B Never: two trains leave from a and B at the same time. They run in opposite directions. The speed ratio of the express train to the local train is 5:3. It takes 12 hours for the express train to leave from a to B. how many hours do they meet after they leave? I'm in a hurry. There must be a result in 2 hours
- 16. The two fast and slow trains run opposite each other from a and B. the slow train takes 8 hours from a to B, which is 1 / 3 longer than the fast train from B to A. if the two trains leave at the same time, the fast train will travel 48 kilometers more than the slow train when they meet. There are two ways to find the distance between a and B
- 17. One train goes from place a to place B at a speed of 40 kilometers per hour; one hour later, the other train stops It also goes from place a to place B at a speed of 50 kilometers per hour. As a result, the two trains arrive at the same time. How many kilometers are there between a and B?
- 18. The average speed of car uphill is a kilometer per hour, and the average speed of car downhill is B kilometer per hour. The distance of car uphill and downhill is s kilometer 1. How many hours does it take for the car to go up and down the mountain at a time 2. What is the average speed of the car up and down the hill 3. If a = 40 km / h, B = 60 km / h, s = 120 km, then how many hours does it take for the car to go up and down the mountain at a time? What is the average speed of the car up and down the mountain
- 19. A car goes up the mountain along a road at a speed of 10km / h, and goes down the mountain from the original road at a speed of 20km / h. The average speed of the car going up and down the mountain is () A. 403km/hB. 12.5km/hC. 14.5km/hD. 15km/h
- 20. A mountain road is 15 kilometers long. A car goes up the mountain 30 kilometers per hour, and goes down the mountain 50 kilometers per hour from the original road