Tamanna goes Pune to Mumbai with 80 kmph and returns to pune with speed of 35 kmph.Find average speed

• Ans: 48.69565KMP.
  
  Soln : Let the distance be 140KM. (you can choose any other distance and it will come to the same answer)
  t1=D/S1=140/80 = 1 and 3/4 hour;
  t2=D/s2=140/35= 4hr
  Total time T=t1+t2 = 5 and 3/4 i.e. 5.75 hours
  Avg Speed = Total distance/ T = (140*2)/5.75 = 48.69565 KMPH
  
• 9 years agoHelpfull: Yes(0) No(0)
• Two distance average speed=2xy/x+y
  So,2(80)(35)/80+35
  Then we get and 48.6
• 9 years agoHelpfull: Yes(0) No(0)
• 48.69Kmph
  The average speed of an object with distance remaining constant is given by = 2*S1*S2/(S1+S2)
  where S1 and S2 are the variable speeds
• 9 years agoHelpfull: Yes(0) No(0)