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Chasity started biking to the bookstore traveling 9 mph, after some time the bike got a flat so Chasity walked the rest of the way, traveling 2 mph. If the total trip to the bookstore took 9 hours and it was 39 miles away, how long did Chasity travel at each speed?

 Oct 29, 2020
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'x' miles at 9 m/hr    +    39-x miles at 2 m/hr = 9 hours

 

x / 9   +   (39-x)/2 = 9

2x + 9(39 - x) = 9 (9)(2)

2x + 351- 9x = 162

- 7x = -189

x = 27                         27 miles by bike = 3 hours    12 miles by foot = 6 hours

 Oct 29, 2020

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