SOLUTION: Maria normally spends half an hour driving to work. When her average speed is ten miles per hour slower than usual, the trip takes ten minutes longer. How many miles does she drive

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Question 977295: Maria normally spends half an hour driving to work. When her average speed is ten miles per hour slower than usual, the trip takes ten minutes longer. How many miles does she drive to work?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
r, normal speed


__________________speed___________time___________distance
Normal_____________r_______________1%2F2___________d
Slower____________r-10____________1%2F2%2B1%2F6_________d

Revise the data

__________________speed___________time___________distance
Normal_____________r_______________1%2F2___________d
Slower____________r-10____________2%2F3_____________d

system%28r%2A%281%2F2%29=d%2C%28r-10%29%282%2F3%29=d%29

r=2d
-
%282d-10%29%282%2F3%29=d
2%282d-10%29=3d
4d-20=3d
highlight%28d=20%29