The hiking trail

Algebra Level 2

In hiking to the top of Mount Gosford Michelle takes the same trail going up and going down the mountain. She calculates that her average speed going down is twice her average speed going up. If her average speed for the hike (going up and then going down) is 4 km /h, what is her average speed going down?

Clarification: She does not spend time at the top of the mountain.

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