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Two trains, one is of 121 m in length at...

Two trains, one is of 121 m in length at the speed of 40 km/hour and the other is of 99 m in length at the speed of 32 km/hour are running in opposite directions. In how much time will they be completely clear from each other from the moment they meet ?

A

10 s

B

11 s

C

16 s

D

21s

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