A 415 m long train is running at 63 km/hr. In how much time will it cross a tunnel 285 m long? Choose the most appropriate option:  A) 25  B) 35  C) 45  D) 60  E) 40
Speed of the train= ( 63 * 5 / 18) m/sec = 35/2 m/sec. Distance travelled = (Speed x Time)   Time = (Distance travelled / Speed)   Distance travelled = Length of the train + Length of the Tunnel   =415+285= 
<gadget id="calculator">415+285</gadget>
<output>700</output>
700m   Time= (700 / 35/2)= 40 sec   Answer: 40
<result>E</result>
A 415 m long train is running at 63 km/hr. In how much time will it cross a tunnel 285 m long?