In what time will a train 140 m long cross an electric pole, it its speed be 108 km/hr? Choose the correct choice from the following answers
A) 2.5
B) 4.7
C) 2.9
D) 2.3
E) 2.1
Speed = 108 * 5/18= 
<gadget id="calculator">108 * 5/18</gadget>
<output>30</output>
30 m/sec   Time taken= 140/30   = 4.7 sec.   Answer: 4.7
<result>B</result>
In what time will a train 140 m long cross an electric pole, it its speed be 108 km/hr?