# 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

**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.