A jogger running at 9 kmph alongside a railway track is 240 metres ahead of the engine of a 120 metre long train running at 45 kmph in the direction opposite to that in which the train is going ?
Choose the correct choice from the following:
A) 3.6sec
B) 18sec
C) 36sec
D) 72sec
E) None
Solution   Speed of train relative to jogger =(45-9)km/hr =36km/hr   (36*5/18)m/sec = 10 m/sec   Distance to be covered = (240 +120)= 
<gadget id="calculator">(240 +120)</gadget>
<output>360</output>
360m   ∴ Time taken=(360/10)= 
<gadget id="calculator">(360/10)</gadget>
<output>36</output>
36 sec   Answer 36sec
<result>C</result>
A jogger running at 9 kmph alongside a railway track is 240 metres ahead of the engine of a 120 metre long train running at 45 kmph in the direction opposite to that in which the train is going ?