A father starts from home at 3.00pm to pick his son from school at 4.00pm .one day the school got over early at 3.00pm.the son started walking home ..he met his father on the way and both returned 15 minutes earlier than the usual time.If the speed of the father is 35km/hr..find the speed of the son in km/hr?? approach pls

1) 4
2) 5
3) 6
4) 7

• 5 km/hr
  
  assuming that father is picking his son in a vehicle with speed 35 km.hr,
  father met the son 15/2 mins before 4 PM.
  so distance travelled by father in 7.5 mins = distance travelled by son in 52.5 mins.
  
  so speed of son is 1/7 th of speed of father, i.e. 35/7 = 5 kmph
  
  if father and son are coming back by walking only, then case is different.
• 12 years agoHelpfull: Yes(2) No(3)
• Why have we divided 15 by 2??
  
• 10 years agoHelpfull: Yes(0) No(0)