Q. Two trains started at 7AM from the same point. The first train travelled north at a speed of 80km/h and the second train travelled south at a speed of 100 km/h. The time at which they were 540 km apart is__________ AM.
(A) 9
(B) 10
(C) 11
(D) 11.30
Ans: 10
Explanation:
The correct option is 10
According to the concept of relative speed in opposite direction speeds should be added
Time of activity=Sum of distance/Sum of speeds
=540/(100+80)=540/180
=3 hours from 7am=10am
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