A train 640 meters long is running with a speed of 64 kmph. The time taken by it to cross a tunnel 140 meters long is?	Choose the correct choice from the following:
A) 44 sec  B) 49 sec  C) 48 sec  D) 16 sec  E) 17 sec
D = 640 + 140= 
<gadget id="calculator">640 + 140</gadget>
<output>780</output>
780   S= 64 * 5/18 = 17.7 mps   T = 780/17.7 = 44 sec   44 secnswer: 44 sec
<result>A</result>
A train 640 meters long is running with a speed of 64 kmph. The time taken by it to cross a tunnel 140 meters long is?