A train of 25 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 2.5 km long?
Pick:  A) 4  B) 3  C) 5  D) 7  E) 9
D = 25 * 60 + 2500= 
<gadget id="calculator">25 * 60 + 2500</gadget>
<output>4_000</output>
4000 m   T= 4000/60 * 18/5= 
<gadget id="calculator">4000/60 * 18/5</gadget>
<output>240</output>
240 sec= 4 mins   4nswer: 4
<result>A</result>
A train of 25 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 2.5 km long?