Two trains 121m and 99m in length, respectively, are running in opposite directions, one at a speed of 40 km/h and the other at a speed of 32 km/h. In what time will they be completely clear of each other from the moment they meet?
Answer & explanation
Correct answer: option 1
Total distance = 121 + 99 = 220 m
Relative speed = 40 + 32 = 72 km/h
72 km/h = 72 × \(\frac{5}{18}\) = 20 m/sec
Total time taken to corss each other = \(\frac{Distance}{Speed}\)
= \(\frac{220}{20}\) = 11 sec