jmc

Question

If you walk for 45 minutes at a rate of 4 mph and then run for 30 minutes at a rate of 10 mph, how many miles will you have gone at the end of one hour and 15 minutes?

Accepted Answer

45 minutes is 34 of an hour, so the walking contributes 3 hr4 4 miles1 hr=3 miles. Similarly, 30 minutes is 12 of an hour, so the running adds 1 hr210 miles1 hr=5 miles. Their total is 3 miles+5 miles=8 miles, which is 8 miles