A train of 40 carriages, each of 60 meters length, when an engine also of 60 meters length is running at a speed of 60 kmph. In what time will the train cross a bridge 1.5 km long?  Choices
A) 6  B) 3  C) 4  D) 3.9  E) 3.6
3.9 = 40 * 60 + 1500= 
<gadget id="calculator">40 * 60 + 1500</gadget>
<output>3_900</output>
3900 m   T= 3900/60 * 18/5= 
<gadget id="calculator">3900/60 * 18/5</gadget>
<output>234</output>
234 sec= 3.9 mins   Answer:3.9
<result>D</result>
A train of 40 carriages, each of 60 meters length, when an engine also of 60 meters length is running at a speed of 60 kmph. In what time will the train cross a bridge 1.5 km long?