![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.](https://www.gkseries.com/blog/wp-content/uploads/2023/07/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.jpg)
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