Give me some physics questions and answers (about distance, speed and time) For example, it takes someone 80 seconds to walk 100 meters, From the formula v = s / T =100m/80s =1.25m/s

Give me some physics questions and answers (about distance, speed and time) For example, it takes someone 80 seconds to walk 100 meters, From the formula v = s / T =100m/80s =1.25m/s

1. The distance between Xiaoming's home and school
Xiaoming starts from home to school. Xiaoming walks to the bus stop at a speed of 60
, and then take the bus to school, found that the time is shorter than walking
The speed of the bus is known to be
How long did it take Xiaoming to get from home to school
2. According to the 12th Five Year Plan of our province, after the completion of Lianyungang Xuzhou passenger dedicated line project, the shortest passenger transport time from Lianyungang to Xuzhou will be shortened from 2 hours and 18 minutes to 36 minutes, and the speed will be increased every hour
. find the train speed after speed increase
3. The railway mileage from Xuzhou to Shanghai is
It is known that the speed of train a is twice that of train B, and the travel time is less than that of train B
. find the speed and travel time of car a
4. A train running at a constant speed passes through a 300 meter long tunnel in 15 seconds (i.e. from the front of the train into the tunnel to the rear of the train leaving the tunnel). It is also known that a beam of light emitted by a fixed lamp at the top of the tunnel vertically irradiates the train for 2.5 seconds
）
1) Find the length of the train
2) If the train passes another tunnel in 25 seconds, find the length of the tunnel
1. A and B climb stairs from the bottom of the building to the top of the building. A climbs 40 stairs per minute on average, B climbs 50 stairs per minute on average, and a starts first
How many stairs are there from the bottom to the top?
2 A, B two people in the distance
The two places are opposite to each other,
After a, B two people apart
The velocity of a is known to be
Find the velocity of B
3. Xiaobin and Xiaoming keep on running every morning. Xiaobin runs 4 meters per second and Xiaoming runs 6 meters per second. (1) if they stand at both ends of the 100 meter track and start at the same time, they will meet each other in a few seconds. (2) if Xiaoming stands at the starting point of the 100 meter track and Xiaobin stands 10 meters in front of him, they start at the same time, and Xiaoming can catch up with Xiaobin in a few seconds
4. A group of students went out of school for military camping training
We're on our way. We're on our way
The school should send an emergency notice to the team leader when the school is in. The correspondent sets out from the school and rides a bicycle to get there
How long does it take for the team leader to get the notice? 5. Two cars start from a at the same time and drive along a road to B. car a travels 8 kilometers more per hour than car B. car a arrives at C 40 minutes earlier than car B. when car B arrives at C, car a just arrives at B. given that the distance from C to B is 40 kilometers, how many kilometers does car B travel per hour?
6. Distance between a and B
The speed of car a is known to be
The speed of car B is
After how many hours, the distance between the two cars
.
7. Vehicle a and vehicle B start from place a at the same time and run back and forth between a and B at a distance of 900 kilometers. It is known that the speed of vehicle a is 25 kilometers per hour and that of vehicle B is 20 kilometers per hour
(1) How long did car a catch up with car B from behind for the first time?
(2) How long does it take for car a to catch up with car B from behind for the first time? How long does it take for car a to catch up with car B from behind for the second time?
(3) How long is the second head-on meeting between a and B vehicles after departure?