SOLUTION: Superman can fly 12 miles in the same amount of time it takes him to run 8 miles. He flies 15 mph faster than he runs. Find both supermans flying speed and running speed

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Question 1013230: Superman can fly 12 miles in the same amount of time it takes him to run 8 miles. He flies 15 mph faster than he runs. Find both supermans flying speed and running speed
Answer by macston(5194) About Me  (Show Source):
You can put this solution on YOUR website!
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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%2FR=12%2F%28R%2B5%29
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12R=8%28R%2B15%29
12R=8R%2B120
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.