Two trucks each 250m long are running in opposite directions on parallel paths. Their speeds are 30 km/hr and 20 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one?
Choose the correct choice from the following answers
A) 77 sec B) 66 sec C) 48 sec D) 55 sec E) 36 sec
Relative speed = 20 + 30= 
<gadget id="calculator">20 + 30</gadget>
<output>50</output>
50 km/hr.   50 * 5/18= 125/9 m/sec.   Distance covered = 250 + 250= 
<gadget id="calculator">250 + 250</gadget>
<output>500</output>
500 m.   Required time= 500 * 9/125= 
<gadget id="calculator">500 * 9/125</gadget>
<output>36</output>
36 sec.   Answer: 36 sec
<result>E</result>
Two trucks each 250m long are running in opposite directions on parallel paths. Their speeds are 30 km/hr and 20 km/hr respectively. Find the time taken by the slower train to pass the driver of the faster one?