SOLUTION: a runner can run 4 miles in 30 minutes what is there speed in mph?

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Question 532145: a runner can run 4 miles in 30 minutes what is there speed in mph?
Found 2 solutions by oberobic, Alan3354:
Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
Their speed = 4 miles/30 min.
30 min = 1/2 hr
4/(1/2) = 8 miles/hr

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
a runner can run 4 miles in 30 minutes what is there speed in mph?
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There speed? Do you mean "their speed?"
Their implies plural, you said "a runner" ????
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Is English not your language?
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30 minutes = 0.5 hours
d = r*t
r = d/t