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OpenStudy (anonymous):
A guy rides his bike through a mountain (upwards) with 20 k/h speed and through down mountain with 60 km/h speed what is his average riding speed. I already have the answer ... it's 30km/h I just am asked to show why is 30km/h and I can't do this.
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OpenStudy (aravindg):
is that math qn?
OpenStudy (anonymous):
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