Mathematics, 07.08.2021 23:20, AWESOMEMIHI

6) Frazer cycles the first 20 miles at an average speed of 21mph. The second part is more uphill, and he only manages 13mph. By what percentage did his
speed decrease?
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6) Frazer cycles the first 20 miles at an average speed of 21mph. The second part is more uphill, a...