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sachin singh Grade: 12
        

A car goes down a certain road at an average speed of 40 km/h and returns along the same road at an average speed of 60 km/h.  Calculate the average speed for the round trip.

7 years ago

Answers : (3)

Chetan Mandayam Nayakar
312 Points
										

let d be the one way distance. average speed for round trip= 2d/((d/40)+(d/60))=2*40*60/(40+60)=48 km/h

7 years ago
vikas askiitian expert
510 Points
										

let the distance between the two points be D


   time taken by car to reach the other point is t1=D/40


  time taken by car to come back to the initial point is t2=D/60


   total distance travelled by car is 2D


                  average speed = total distance /total time


                                        =2D/(D/40 + D/60)


                                         =48km/h

7 years ago
rajiv kumar
31 Points
										

50 m/s.

7 years ago
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