Question

A train of length 150m travelling with a speed of 20 metre per second crosses another train of same length travelling in opposite direction on a parallel track with a speed of 10 metre per second .Time taken by the train to cross each other Is??​

Answer 1

Answer:

Trains crossing each other from opposite directions.

So length of both trains will be added.

train 1 = 150 m

train 2 = 150 m

Relative distance = 300 m

Speed of train 1 = 20 m/s

Speed of train 2 = 10 m/s

Trains are coming from opposite directions,

So,

Speeds of trains will be added

Relative speed = (20 + 10)m/s

= 30 m/s

Speed = Distance/time

Time = Distance/speed

Time = 300 m ÷ 30 m/s

300/30 = 10

So, 10 sec is the time for train to cross each other.

If in the case of trains in same directions

Relative distance = addition of length of train (L1 + L2)

Realative speed = Subtraction of speed (S1 - S2)