ANSWER: D
Explanation:
Total distance covered to cross each other = 200 + 160
= 360m
If the direction is given in the same direction then we subtract
Relative speed of two trains (same direction) = (120 – 96)km/hr
= 24 km/hr
Convert km/hr into m/s
24 km/hr = (24 * 5 / 18) m/s
= 20 / 3 m/s
Time taken to cross = distance / speed
= 360 / (20/3)
= 360 * 3 / 20
= 54sec
Time taken by the faster train to cross the slower train is 54sec.