How long does a train 110 metres long running at the speed of 72 km/hr take to cross a bridge 132 metres in length?

A 9.8 sec
B 12.1 sec
C 12.42 sec
D 14.3 sec

Correct Answer: 12.1 sec

Hints: To convert km/hr into m/s, multiply with 5/18 So, 72km/hr = (72×5)/ 18 m/s = 20 m/s Time required to cross the bridge = (110 + 132)/20 seconds = 12.1 seconds
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#গণিত #ট্রেন ও  গতিবেগ (Train & Speed) #Probashi Kallyan Bank #Probashi Kallyan Bank - Senior Officer - 14.02.2014

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