Two trains 121 m and 99 m in length are running in opposite directions with velocities 40 $k m h^{- 1}$ and 32 $k m h^{- 1}$ . In what time they will completely cross each other?

9 s

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11 s

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13 s

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15 s

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Solution

The correct option is B 11 s
For the two trains -
Velocity of approach $= 72 k m / h r = 20 m / s$
Distance to be traveled $= (121 + 99) m = 220 m$
Time taken $= \frac{220}{20} = 11 s e c .$

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Two trains 121 m and 99 m in length are running in opposite directions with velocities 40 km h−1 and 32 km h−1. In what time they will completely cross each other?

The correct option is B 11 sFor the two trains -Velocity of approach =72km/hr=20m/sDistance to be traveled =(121+99)m=220mTime taken =22020=11sec.

Two trains 121 m and 99 m in length are running in opposite directions with velocities 40 $k m h^{- 1}$ and 32 $k m h^{- 1}$ . In what time they will completely cross each other?

The correct option is B 11 s
For the two trains -
Velocity of approach $= 72 k m / h r = 20 m / s$
Distance to be traveled $= (121 + 99) m = 220 m$
Time taken $= \frac{220}{20} = 11 s e c .$