A girl rode her bicycle from home to school, a distance of 15 miles, at an average speed of 15 miles per hour. She returned home from school by walking at an average speed of 5 miles per hour. What was her average speed for the round trip if she took the same route in both directions?

• avg speed=(total disance)/(total time)
  ans=7.5 miles/hr
• 11 years agoHelpfull: Yes(10) No(0)
• AVG SPEED CAN B FOUND BY 2ab/a+b.
  hence two avg speeds a=15mph b=5mph avg speed=2*15*5/15+5=7.5 miles p hr
• 11 years agoHelpfull: Yes(9) No(0)
• avg speed=(total disance)/(total time)
  total distance= 15+15
  total time= 1+3=4
  ans=7.5 miles/hr
• 11 years agoHelpfull: Yes(7) No(0)
• average speed of a girl is 2xy/x+y
  2*15*5/15
  =7.5 ml/hr
• 8 years agoHelpfull: Yes(1) No(0)
• 15 miles/hr
• 11 years agoHelpfull: Yes(0) No(10)