Question

personal shopping Palace to railway line at a speed of 5 kilometre per hour train traveling in the opposite direction at 49 kilometre per hour past him in 12 second find:
(1) THE LENGTH OF TRAIN
(2) THE TIME TAKEN BY IT TO PASS ANOTHER TRAIN 160m LONG,COMING FROM THE OPPOSITE SIDE AT A SPEED OF 41 km/hr.​

Answer 1

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