a square field with 10km side is ther. a girl walks along the 1st side at 10kmph, 2nd side at 20kmph, 3rd side at 30kmph, 4th side at 40kmph, what is her average speed?

• ans=19.2kmph
  total time=
• 12 years agoHelpfull: Yes(12) No(2)
• ans is 19.2
  avg speed =total distance /total time
  so ttl dis. =40km n ttl time is time taken at each side i.e (10/10 + 10/20 + 10/30 + 10/40) that will be 25/12 so
  40/(25/12)=19.2
  
• 12 years agoHelpfull: Yes(3) No(0)
• 19.2 is correct
• 12 years agoHelpfull: Yes(2) No(2)
• how
  would any one explain it clearly?
• 12 years agoHelpfull: Yes(1) No(1)
• 33.89 may b
• 12 years agoHelpfull: Yes(0) No(5)
• ans is 24.53
• 12 years agoHelpfull: Yes(0) No(4)
• 10/10+10/20+10/30+10/40=(4*10)/avg speed
  avg speed=19.2 ans
• 12 years agoHelpfull: Yes(0) No(2)