Two good train each 650 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 most appropriate option:  A) 12.4 sec  B) 24.3 sec  C) 62.4 sec  D) 60.1 sec  E) None
Sol.   Relative Speed = (45 + 30) km / hr   = (75 x 5 / 18) m/sec   = (125/6) m/sec.   Distance covered = (650+ 650)= 
<gadget id="calculator">(650+ 650)</gadget>
<output>1_300</output>
1300 m.   Required time= (1300 x 6 / 125) sec = 62.4 sec.   Answer 62.4 sec
<result>C</result>
Two good train each 650 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.