In what time will a train 100 m long cross an electric pole, it its speed be 126 km/hr? Choose the correct choice from the following answers:
A) 2.5 B) 2.9 C) 2.4 D) 2.85 E) 2.1
Speed = 126 * 5/18= 
<gadget id="calculator">126 * 5/18</gadget>
<output>35</output>
35 m/sec   Time taken= 100/35   = 2.85 sec.   Answer:2.85
<result>D</result>
In what time will a train 100 m long cross an electric pole, it its speed be 126 km/hr?