In what time will a train 140 m long cross an electric pole, it its speed be 144 km/hr?
Answers.
A) 2.5  B) 3.5  C) 4  D) 5  E) 6
Speed = 144 * 5/18= 
<gadget id="calculator">144 * 5/18</gadget>
<output>40</output>
40 m/sec   Time taken= 140/40= 
<gadget id="calculator">140/40</gadget>
<output>7/2 = around 3.5</output>
3.5 sec.   Answer: Option 3.5
<result>B</result>
In what time will a train 140 m long cross an electric pole, it its speed be 144 km/hr?