a train travelling at 72kmph starts overtaking a motorcyclist travelling at 36kmph at 4 pm and overtakes him in 20 secs. Then the train travels for exactly half an hour and starts crossing another motorcyclist travellng at 36kmph in the opposite direction. When will the second motorcyclist meet the first motorcyclist?
(A)4:45PM
(B)5 PM
(C)5:15PM
(D)none of these

• the train moves for half an hour
  => distance covered by the train = 72*0.5=36km
  now the distance covered by the motorcycle in the same direction as train
  = 36*0.5 = 18km
  so the distance between the two motorcycle is 36-18 = 18km
  
  so the time taken to meet each other
  = 18/(36+36) = 18/72 hr = 15 min
  so the total time
  = 4:00 + 30min +15min
  =4:45pm
  
  
• 10 years agoHelpfull: Yes(6) No(0)