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My friend sets out walking at a speed of $3$ miles per hour. I set out behind her $5$ minutes later at $4$ miles per hour. When I start walking, how many miles has my friend traveled?

 Jan 19, 2020
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When you start walking, your friend has been walking 5 minutes (1/12 hr)  at 3 m/hr

 

Rate  x time = distance

3 m/hr  x 1/12/hr = 3/12 mile = 1/4 mile

 Jan 19, 2020

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