A car travels uphill at 30 km/hr and downhill at 60 km/hr. It goes 100 km uphill and 50 km downhill. Find the average speed of the car?

• avg speed=total distance/total time.
  total distance traveled=100+50=150km;
  time taken for uphill journey=100/30=10/3;
  time taken for down hill journey=50/60=5/6;
  avg speed=150/(10/3+5/6)=36kmph;
• 13 years agoHelpfull: Yes(14) No(2)
• 36km/hr
• 13 years agoHelpfull: Yes(3) No(1)
• we konw that speed = total distance travelled/total time
  so total distance=150km.
  timetaken for uphill=100/30
  timetaken for downhill=50/60;
  avg speed=150/(100/30+50/60)=36kmph;
• 11 years agoHelpfull: Yes(0) No(0)
• 1/30 + 1/60 =20km/hr is the avg speed...
• 9 years agoHelpfull: Yes(0) No(1)