Question 1013230
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Distance=(rate)*(time)
time=distance/rate
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Let R=rate he runs
Using time running=time flying:
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{{{8/R=12/(R+5)}}}
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{{{12R=8(R+15)}}}
{{{12R=8R+120}}}
{{{4R=120}}}
{{{R=30}}}
ANSWER 1: He runs at 30 mph.
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Rate flying=R+15mph=30mph+15mph=45mph
ANSWER 2: He flies at 45 mph.