Question

41. Two trains A and B start running together from the
same point in the same direction at 90 kmph and
60 kmph respectively. If the length of each train is
250 m, then how long will it take for the train B to
cross train A?
A. 2 mins 15 secs
B. 1 min
C. 2 mins 05 secs
D. 1 min 30 secs​

Answer 1

Answer:

$(2 min \: 05sec$

Answer 2

It will take 1 minute for train B to cross train A.

Given,

Speed of train A= 90 km/hr

Speed of train B= 60 km/hr

So, the relative speed =( 90-60) km/hr = 30 km/hr

[ Since they are travelling in the same direction, we subtract to find the relative speed]

Length of each train= 250m

The total length of the trains=( 250+250)m = 500m = 0.5km

So the time taken to cross= Distance/Relative speed = (0.5/30)* 60 min = 1 min