hanming30024 hanming30024

21-11-2017
Mathematics

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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. For how many minutes will my friend have been walking when I catch up to her?

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barrycarter barrycarter

21-11-2017

Hints: how far behind her will you be when you start (miles, not just hours). What equation then describes your position and your friend's position.

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