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Train A 120 m long is moving with 20 m/s...

Train A 120 m long is moving with 20 m/s. Train B 130 m long is moving with 30 m/s in opposite direction. In what time, train B will cross train A?

A

65

B

365

C

385

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
Speed of train `A v _(A) = 20 m//s`
Speed of train `B v _(B) = 30 m//s`
If both trains moving in opposite, then relative speed,
`v = v _(A) +v_(B)`
`=20+30 =50m//s`
Total length of both trains,
` l = (120 +130) m = 250 m`
TIme taken to cross,
`t = (l)/(v) = (250)/(50) =5s`
This is not given in options.
`therefore ` The correct option is (D).
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