Two trains 140 m and 170 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite ...

Two trains 140 m and 170 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time which they take to cross each other is?

Quiz

Answer/Solution

11.16 sec

Steps/Work

Relative speed = 60 + 40 = 100 km/hr.
= 100 * 5/18 = 250/9 m/sec.
Distance covered in crossing each other = 140 + 170 = 310 m.
Required time = 310 * 9/250 = 11.16 sec.
Answer: B:

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Two trains m and m long run at the speed of km / hr and km / hr respectively in opposite directions on parallel tracks. The time which they take to cross each other is?

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