In what time will a train 100 m long cross an electric pole, it its speed be 72 km/hr?
Choose the correct answer:
A) 2.5
B) 5
C) 2.4
D) 2.8
E) 2.1
Speed = 72 * 5/18= 
<gadget id="calculator">72 * 5/18</gadget>
<output>20</output>
20 m/sec   Time taken= 100/20= 
<gadget id="calculator">100/20</gadget>
<output>5</output>
5 sec.   Answer:5
<result>B</result>
In what time will a train 100 m long cross an electric pole, it its speed be 72 km/hr?