While running a marathon a long-distance runner uses a


While running a marathon, a long-distance runner uses a stopwatch to time herself over a distance of 100 . She finds that she runs this distance in 21 . Answer the following by considering ratios, without computing her velocity.

a) If she maintains her speed, how much time will it take her to run the next 400 ?

b) How long will it take her to run a mile at this speed?

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Physics: While running a marathon a long-distance runner uses a
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