A train crosses a platform 100 m long in 60 seconds at a speed of 45 km/hr. The time taken by the train to cross an electric pole is :
Choose the correct choice from the following
A) 8 sec
B) 52 sec
C) 1 minute
D) Data inadequate
E) None of these
Explanation:   Speed = (45 *5/18)m/sec =25/2m/sec   Let the length of the train be x metres.   Then,x+100 / 25/2 =60 or x=650m   Time, taken by the train to cross an electric pole = (650 *2/25)= 
<gadget id="calculator">(650 *2/25)</gadget>
<output>52</output>
52 sec.   ANSWER IS 52 sec
<result>B</result>
A train crosses a platform 100 m long in 60 seconds at a speed of 45 km/hr. The time taken by the train to cross an electric pole is :