Question

A train of length 150 m is traveling with speed 54 km/h. From opposite direction another train of length 200 m is traveling with speed 72 km/h. How much time will be taken by the trains to cross each other? ​

Answer 1

Answer:

after10seconds

Explanation:

As, length is 150m so, 54×5/18=15m/sec we did that to convert km per hour in mpsec. similarly 72 km per hour =72×5/18=20mpsec . now as they are coming from opposite directions so

sum of length of the train/relative speed

relative speed is sum of their speed.

150+200/15+20=350/35=10sec

Answer 2

Explanation:

Length of the first train = 150 m

speed of this train. = 54km/hr

= 54 × 5/18

= 15 m/s

length of the second train = 200m

speed of this train = 72 km/hr

= 72 ×5/18

= 20 m/s

now total length = 200+150

= 350 m

Since both trains are running in opposite direction speed will be added

now final speed = 15 + 20

=35 m/s

time in crossing = 350/35

= 10 sec

This is your answer