Two train each 500 m long, are running in opposite directions on parallel tracks. If their speeds are 45 km/hr and 30 km/hr respectively, the time taken by the slower train to pass the driver of the faster one is
Select the correct option:
A) 50 sec	B) 58 sec	C) 24 sec	D) 22 sec	E) 21 sec
Explanation:   Relative speed = 45+30= 
<gadget id="calculator">45+30</gadget>
<output>75</output>
75 km/hr= 750/36 m/s = 125/6 m/s   We are calculating the time taken by the slower train to pass the driver of the faster one   .Hence the distance = length of the smaller train = 500 m   Time = distance/speed = 500/(125/6)= 
<gadget id="calculator">500/(125/6)</gadget>
<output>24</output>
24 sec   Answer: Option 24 sec
<result>C</result>
Two train each 500 m long, are running in opposite directions on parallel tracks. If their speeds are 45 km/hr and 30 km/hr respectively, the time taken by the slower train to pass the driver of the faster one is