if jack walked 7 miles in 1 hour and 15 minutes , what was his rate of walking in miles per hour ?
"distance walked in 1 hour and 15 mins = 7 miles speed per hour = distance / time = 7 / ( 5 / 4 ) = 5.6 miles per hour answer c"
divide(multiply(7, const_60), add(15, const_60))