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`        A car travels a certain distance with a speed of 40 m/s and returns with a speed u. If the average speed for the whole journey is 48 m/s, what is the value of u? Ans= 60 m/s.`
2 years ago

## Answers : (1)

Arun
23379 Points
```							Dear student Avg speed = 2x y /(x+y)48 = 2* 40 *u/(40+u) 1920 + 48 u = 80 u32u = 1920u = 60  Hence u = 60 m/sec  RegardsArun (askIITians forum expert)
```
2 years ago
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