Robert is travelling on his cycle and has
calculated to reach point A at 2 pm., if he
travels at 10 km./hr., he will reach at 12 noon
if he travels at 15 km./hr. At what speed must
he travel to reach A at 1 pm. ?

• ans is 12km/h
• 10 years agoHelpfull: Yes(1) No(0)
• ans=12km/hr
  Let the distance travelled by x km
  Time = Distance/Speed
  
  x10−x15=2[because, 2 pm - 12 noon = 2 hours]3x−2x=60x=60.Time=DistanceSpeedTime@10km/hr=6010=6hours
  
  So 2 P.M. - 6 = 8 A.M
  Robert starts at 8 A.M.
  
  He have to reach at 1 P.M. i.e, in 5 hours
  
  So, Speed = 60/5 = 12 km/hr
• 10 years agoHelpfull: Yes(0) No(0)