Question

janet started biking to the study group traveling 15 mph, after some time the bike got a flat so janet walked the rest of the way, traveling 3 mph. if the total trip to the study group took 9 hours and it was 75 miles away, how long did janet travel at each speed?

Answer 1

Explanation:

rate x time = distance

15 * b + 3 * w = 75

and b + w = 9 or : w = 9-b <===sub into first equation

15*b + 3 ( 9-b) = 75

12 b + 27 = 75

b = 4 hrs then w = 9-b = 5 hrs