if jack walked 6 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 = 6 miles speed per hour = distance / time = 6 / ( 5 / 4 ) = 4.8 miles per hour answer b"
divide(multiply(6, const_60), add(15, const_60))