Problema Solution
To prepare for a marathon run, Sue ran 42 miles before she blistered her heel, and then she walked 1 additional mile. Her running speed was 12 times as fast as her walking speed. She was running and walking for 9 hours. Find Sue's running speed
Answer provided by our tutors
Let 'v' represent Sue's running speed, then her walking speed is 'v/12'.
Since speed = distance/time follows time = distance/speed thus we have:
42/v + 1/(v/12) = 9
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click here to see the equation solved for v
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v = 6 mph
Sue's running speed was 6 miles per hour.