Two good train each 500 m long, are running in opposite directions on parallel tracks. Their speeds are 45 km / hr and 30 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 options:
A) 12 sec B) 24 sec C) 48 sec D) 60 sec E) None
Sol.   Relative Speed = (45 + 30) km / hr   = (75 x 5 / 18) m/sec   = (125/6) m/sec.   Distance covered = (500 + 500)= 
<gadget id="calculator">(500 + 500)</gadget>
<output>1_000</output>
1000 m.   Required time= (1000 x 6 / 125) sec = 48 sec.   Answer 48 sec
<result>C</result>
Two good train each 500 m long, are running in opposite directions on parallel tracks. Their speeds are 45 km / hr and 30 km /hr respectively. Find the time taken by the slower train to pass the driver of the faster one.