Two trains one 160 m and the other 140 m long are running in opposite directions on parallel rails, the first at 77 km an hour and the other at 67 km an hour. How long will they take to cross each other?a)7 sb)c)6 sd)10 sCorrect answer is option 'B'. Can you explain this answer?

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Two trains one 160 m and the other 140 m long are running in opposite directions on parallel rails, the first at 77 km an hour and the other at 67 km an hour. How long will they take to cross each other?

a)
7 s
b)
c)
6 s
d)
10 s

Correct answer is option 'B'. Can you explain this answer?

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Two trains one 160 m and the other 140 m long are running in opposite...

If two trains be moving in opposite directions at rates wand vkm/h respectively, then their relative speed = (u+ v) km/h

Further, if their lengths are x and y km.

Then, time is taken to cross each other =

Here, total length = 160 + 140 = 300 m

Relative speed = (77 + 67) km/h = 144 km/h

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