SOLUTION: How far can a person drive into the country at the average rate of 30MPH and return over the same road at the average rate of 20 MPH if the person travels a total of 5 hours?
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Question 992951: How far can a person drive into the country at the average rate of 30MPH and return over the same road at the average rate of 20 MPH if the person travels a total of 5 hours?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = time in hrs for 1st part of trip
(1)
(2)
Substitute (1) into (2)
(2)
(2)
(2)
(2)
and
(1)
(1)
The person can drive 60 mi into country
------------
check:
(2)
(2)
(2)
OK
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