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`        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

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
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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