How many seconds will a train 100 meters long take to cross a bridge 150 meters long if the speed of the train is 42 kmph? Pick one.
A) 21.4 sec
B) 77 sec
C) 25 sec
D) 18 sec
E) 17 sec
D = 100 + 150= 
<gadget id="calculator">100 + 150</gadget>
<output>250</output>
250   S= 42 * 5/18 = 11.7 mps   T = 250/11.7 = 21.4 sec   21.4 secnswer:21.4 sec
<result>A</result>
How many seconds will a train 100 meters long take to cross a bridge 150 meters long if the speed of the train is 42 kmph?