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 option.
A) 36 sec
B) 38 sec
C) 44 sec
D) 52 sec
E) None
Sol.   Speed = [45 * 5/18] m/sec = [25/2] m/sec.   Let the length of the train be x metres.   Then, x + 100 / [25/2] = 60 or x = 650 m   ∴ time taken by the trian to cross an electric pole   = [650 * 2/25= 
<gadget id="calculator">650 * 2/25</gadget>
<output>52</output>
52 sec.   Answer 52 sec
<result>D</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 :