In what time will a train 90 m long cross an electric pole, it its speed be 72 km/hr?	Select the correct option
A) 1.5	B) 2.5	C) 3.5	D) 4.5	E) 5.5
Speed = 72 * 5/18= 
<gadget id="calculator">72 * 5/18</gadget>
<output>20</output>
20 m/sec   Time taken= 90/20= 
<gadget id="calculator">90/20</gadget>
<output>9/2 = around 4.5</output>
4.5 sec.   Answer: 4.5
<result>D</result>
In what time will a train 90 m long cross an electric pole, it its speed be 72 km/hr?