a bicyclist encounters a series of hills.uphill speed is always v1 and downhill speed is always v2.the total distance travelled is l,with uphill and downhill portions of equal length,the cyclist's average speed is

1.v1/v2

2.v2/v1

3.v1v2/v1+v2

4.2v1v2/v1+v2

Total distance traveled = I

Total distance traveled uphill = Total distance traveled downhill = I/2.

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