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Lê Quốc Trần Anh Coordinator

13/11/2017 at 17:52
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A square measures 80 yd on a side. Bob and Rob begin running from the same corner. Bob runs along a side to an adjacent corner, and Rob runs along a diagonal to an opposite corner. They arrive at their respective corners at the same time. If Bob’s speed was 8 mi/h, what was Rob’s speed? Express your answer as a decimal to the nearest tenth.



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    Phan Thanh Tinh Coordinator 13/11/2017 at 20:06

    The distance Rob runs is \(\sqrt{2}\) times as long as the distance Bob runs and they arrive at their respective corners at the same time, so Rob's speed is \(8\sqrt{2}\approx11.3\) ( mi/h)

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