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## Homework Statement

A Bus drives 1km up a hill in 5.0 minutes. It then drives down the hill in 4.0 minutes. For the bus, find

a) the average speed up the hill

b) the average speed down the hill

c)the average speed for the whole trip

d)why is the answer for c) not equal to

*(speed up the hill + speed down the hill) / 2*

## Homework Equations

v = d / t

## The Attempt at a Solution

a) 1000/300 = 3.33 m/s

b) 1000/240 = 4.16 m/s

c) (1000 + 1000) / (300 + 240) = 3.70 m/s

d) *This is what i do not understand* The formula i am suppose to prove incorrect returns the same result as my calculation. Are my previous calculations incorrect, or are they suppose to be equal.

ie. (3.33 + 4.16)/2 = 3.745 m/s

Thanks,

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