Question

A person is walking parallel to a railway line at a speed of 5 kmph. A train travelling in the opposite direction at 49 kmph passed him in 12 s. Find-a)The length of the train. b)The time taken by it to pass another train 160 m long, coming from the opposite side at a speed of 41 kmph

Answer 1

Step-by-step explanation:

We know

distace=speed×time

Here the distance is the length of the train.

When two objects bodies are moving in opposite directions at x km/hr and y km/hr then their relative speed=(x+y) km/hr

Therefore, relative speed=49+5=54 km/hr

⇒relative speed=54 km/hr=54×

18

5

=15 m/s

time=12 sec

distance=15×12=180 m