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Suzanne is exercising on a treadmill. She first runs at a speed of 6 miles per hour for 10 minutes and then she jogs at a speed of 3 miles per hour for 5 minutes. What is her average speed while exercising on the treadmill?

 Apr 13, 2020
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[6 m/hr x 1/6 hr   + 3 m/hr X 1/12 hr] / (1/6 + 1/12 hr)  = .......   m/hr average

 Apr 13, 2020

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