A railway train 100 meter long is running the speed of 30 km/h. In what time will it pass a bridge 80 meter long ?

A railway train 100 meter long is running the speed of 30 km/h. In what time will it pass a bridge 80 meter long ?

A. 17.6 sec

B. 15 sec

C. 21.6 sec

D. 12.6 sec

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