A train of 45 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?  Choose one:
A) 6 B) 3 C) 4.2 D) 9 E) 4
D = 45 * 60 + 1500= 
<gadget id="calculator">45 * 60 + 1500</gadget>
<output>4_200</output>
4200 m   T= 4200/60 * 18/5= 
<gadget id="calculator">4200/60 * 18/5</gadget>
<output>252</output>
252 sec= 4.2 mins   Answer:4.2
<result>C</result>
A train of 45 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?