In what time will a train 180 m long cross an electric pole, it its speed be 144 km/hr?
Select the correct option:
A) 2.5 sec
B) 1.9 sec
C) 8.9 sec
D) 4.5 sec
E) 2.9 sec
Speed = 144 * 5/18= 
<gadget id="calculator">144 * 5/18</gadget>
<output>40</output>
40 m/sec   Time taken= 180/40= 
<gadget id="calculator">180/40</gadget>
<output>9/2 = around 4.5</output>
4.5 sec.   Answer: 4.5 sec
<result>D</result>
In what time will a train 180 m long cross an electric pole, it its speed be 144 km/hr?