SOLUTION: a runner completes a 10 km race in 42 minutes. traveling his average speed, approximately how many minutes would it take him to run 4 miles?

Question 878425: a runner completes a 10 km race in 42 minutes. traveling his average speed, approximately how many minutes would it take him to run 4 miles?
Answer by JulietG(1812) (Show Source): You can put this solution on YOUR website!
10km is equivalent to ~6.2137 miles
He runs ~6.2137 in 42 minutes. How many in 60 minutes?
=
x = 8.8767 mph
.
If he can run 8.8767 miles in one hour, how long does it take to run 4 miles?
4/8.8767 = 0.45 of an hour
60 minutes in an hour, so 60*.45 = 27 minutes
(numbers are rounded, so it's an approximation)

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