Question #56688

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Answer 1 · 2016-12-07T13:48:21

Assuming running velocity is constant.

She can run 7 miles in 1 hour

Let the velocity (speed) in miles per hour be: #" "v" mph"#

#" "#velocity x time = distance

#" "=>vxx1/8=7/8" miles"#

Multiply both sides by #color(red)(8)#

#" "color(green)(vxx color(red)(8xx)1/8" "=" "7/8color(red)(xx8))#

#" "vxx8/8" "=" "7xx8/8#

But #8/8=1#

#" "vxx1=7xx1#

#" "v=7" mph"#