Problema Solution
On a trip that took 10 hours, Mark drove 2 fewer hours than Mary. How many hours did Mary drive?
Answer provided by our tutors
let
x = the hours that Mark drove
y = the hours that Mary drove
the trip took 10 hours
x + y = 10
Mark drove 2 fewer hours than Mary
x = y - 2
by solving the system of equations
x + y = 10
x = y - 2
we find
x = 4 hr
y = 6 hr
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Mary drove for 6 hours.