SOLUTION: on a trip of 600km, zoe drove part of the way at 80km/h and the remainder at 90km/h. if the total trip took 7 hours, how far did she drive at each rate

Question 1140768: on a trip of 600km, zoe drove part of the way at 80km/h and the remainder at 90km/h. if the total trip took 7 hours, how far did she drive at each rate

Found 2 solutions by greenestamps, josgarithmetic:
Answer by greenestamps(13203) (Show Source): You can put this solution on YOUR website!

Let x be the distance traveled at 80km/h; then (600-x) is the distance traveled at 90km/h.

The time spent at 80km/h is then x/80; the time spent at 90km/h is (600-x)/90.

The total time was 7 hours:

Solve using basic algebra....
Answer by josgarithmetic(39623) (Show Source): You can put this solution on YOUR website!

SPEED TIME DISTANCE part1 80 (600-d)/80 600-d part2 90 d/90 d TOTAL 7 600

Solve for d and evaluate 600-d.
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