# Kilometers 7631

At 8:00, Peter set out on a hike at 5 km/h. At 9:12, Michal followed him on a bike at a speed of 20 km/h. At what time did Michal Petra run, and how many kilometers did he cover?

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### You need to know the following knowledge to solve this word math problem:

**statistics**- harmonic mean
**algebra**- equation
- expression of a variable from the formula
**basic functions**- reason

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