Cyclist

Cyclist goes uphill 10 km for 50 minutes and downhill minutes for 29 minutes, both applied to the pedals same force. How long he pass 10 km by plane?

Result

t =  36.7 min

Solution:

$\dfrac{1}{ 50}+\dfrac{1}{ 29} = \dfrac{2}{ t} \ \\ \ \\ t = \dfrac { 2\cdot 50\cdot 29}{ 50+29 } = 36.7 \ \text{min}$

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