Two good train each 900 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.
A) 12.2 sec	B) 24.9 sec	C) 86.4 sec	D) 60.2 sec	E) None
Sol.   Relative Speed = (45 + 30) km / hr   = (75 x 5 / 18) m/sec   = (125/6) m/sec.   Distance covered = (900 + 900) m = 1000 m.   Required time = (1800 x 6 / 125) sec = 86.4 sec.   Answer 86.4 sec
<result>C</result>
Two good train each 900 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.