Question

you average 55 miles per hour while driving to a relative's house. On the return trip, you average 50 miles per hour because of bad weather. The total driving time is 5 hours and 15 minutes. How long does each trip take?

Answer 1

Explanation:

Distance / rate = time the two distances are the same =d

d / 55 + d / 50 = 5.25 hr <==== ( 15 min is .25 hr)

(10 d + 11d ) / 550 = 5.25

21d = 2887.5

d =137.5 mi

distance /rate = time

137.5 mi / 55 mi/hr = 2.5 hr the rest of the time was at 50 m/r = 2.75 hr