Relative Speed

Q.

Two trains of length 150 m and 170 m respectively are running at the speed of 40 km/hr and 32 km/hr on parallel tracks in opposite directions. Find the time taken for them to cross each other.

1. 1 s

2. 12 s

3. 15 s

4. 16 s

Q. Two trains are travelling at an average speed 50 kmph and 100 kmph respectively on parallel tracks in the same direction. The fast train starts 2 hours later than the slow train. After how many kilometers does the fast train catch up with the slow train?

1. 200

Q.

Two trains moving in the same direction and at the same speed will be ___.

1. at rest with respect to each other

2. in motion with respect to each other

3. at rest with respect to an observer standing outside the train

4. in motion with respect to an observer standing outside the train.

Q.

Two athletes are running from the same place at speed of 6km/hr and 4km/hr.Find the distance between them after 10 minutes, if they move in same direction.(in meters)

1. 599.6m

2. 364m

3. 333.33m

4. 66m

Q.

Two trains A and B run in opposite directions. They start from the same point at uniform speeds of 45 km/hr and 50 km/hr. The distance between them after 4 hrs will be:

1. 370 km

2. 380 km

3. 390 km

4. 400 km

Q. The time taken by 150 m long train running at a speed of 72 km/hr to pass a bridge is 12.5 s. The length of the bridge is.

1. 100 m
2. 90 m
3. 120 m

Q. A man is standing on a railway bridge which is 180 m long. He finds that a train crosses the bridge in 20 seconds and crosses the man in 8 seconds. Find the length of the train.

1. $\frac{240}{2}$ meters
2. 60 meters
3. 120 meters
4. 70 meters

Q. Two athletes are running from the same place at a speed of 6 km/hr and 4 km/hr in the same direction. is the distance between them after 10 minutes.

1. 337.43 m
2. 333.33 m
3. 299.6 m

Q. A train 125 m long crosses an equally long train at rest in 10 s. What is the speed of the train in kmph?

1. 90

Q.

Rahul covers a part of the journey at 20 km/hr and the remaining at 70 km/hr, taking total of 8 hours to cover the distance of 410 km. How many hours he has been driving at 20 km/hr?

1. 2hours

2. 4hours

3. 8hours

4. 3hours

Q.

What is the numerical ratio of average velocity to an average speed of an object moving along a straight path?

Q. A 25 m long train moving on a straight level track passes a pole in 5 s, find the time taken by the train to cross a 50 m long bridge(in s).

1. 15

Q.

John travels first 20 km at 2km/hr and the next 20 km at 10 km/hr. The total time taken by him in completing the journey will be

1. None of these

2. 20 hrs

3. 10 hrs

4. 40 hrs

Q.

Train and car start together from a point. The train's speed is 80 kmph and the car's speed is 60% of the train's speed. The train crosses a station in 15 minutes. How much distance will the car travel in the time the train takes to cross 3 stations? (Assume constant distance between consecutive stations)

1. 45 km

2. 54 km

3. 48 km

4. 36 km

Q. Two trains are moving at a speed of 90 km/h and 110 km/h in the same direction. Find the relative speed.

1. 10 km/h
2. 200 km/h
3. 20 km/h
4. 60 km/h

Q.

A train 165 m long is running at the speed of 60 km/hr. Find the time taken to pass a man who is running at a speed of 6 km/hr in the same direction as that of the train?

1. 10 s

2. 18 s

3. 11 s

4. 15 s

Q. Two trains are moving at an equal speed of 90 km/h in opposite directions. Find the relative speed.

1. 90 km/h
2. 150 km/h
3. 0 km/h
4. 180 km/h