Two trains move in the same direction at speeds 50 kmph and 32 kmph respectively. A man in the slower train observes that 15 seconds elapse before the faster train completely passes by him. What is the length of faster train?
(a) 100m (b) 75m (c) 120m (d) 50m

• The relative speed=50kmph-32kmph=18kmph.
  convert it into m/s --> 18*5/18=5m/s.
  Answer is 15*5=75m
• 13 years agoHelpfull: Yes(3) No(0)