Brady rose his bike 70 miles in 4 hours. He rode at an average speed of 17 mph for t hours and at an average rate of speed of 22 mph for the rest of the time. How long did Brady ride at the slower speed? Use the variable t to represent the time, in hours, Brady rode at 17 mph.

Guest Jan 14, 2020

#1**+2 **

Rate * t = Distance

t is the time @ 17 mph

4hrs-t is the time at 22 mph

17*t + 22(4-t) = 70

17t + 88 - 22t = 70

-5t = -18

t = 3.6 hrs @ 17 mph .4 hr @ 22

ElectricPavlov Jan 14, 2020