Two trains of length 100 m and 150 m are travelling in opposite directions at speeds of 75

Two trains of length 100 m and 150 m are travelling in opposite directions at speeds of 75 km/h and 50 km/h respectively. What is the time taken by them to cross each other?
(a) 7.4 seconds
(b) 7.2 seconds
(c) 7 seconds
(d) 6.8 seconds

Anurag Mishra Professor Asked on 29th February 2016 in Maths.
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1 Answer(s)

Answer: (b) 7.2 seconds 

Solution:-
The length of two trains 100 m & 150 m

The speed of two trains = 75 km/hr & 50 km/hr

Time taken both trains to cross each other = (.1 + .15)/(75 + 50)
= .25/125 hr
= .25 x 60 x 60/125
= 36/5
= 7.2 seconds

Hence, the correct answer is option (b) 7.2 seconds.

Anurag Mishra Professor Answered on 5th March 2016.
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