SOLUTION: a car travel 300km at uniform rate.if the speed of the car had been 5km/h more, the journey would have taken 2 hours less.what is the speed of car?

Question 941036: a car travel 300km at uniform rate.if the speed of the car had been 5km/h more, the journey would have taken 2 hours less.what is the speed of car?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = the car's normal rate
Let = the car's time traveling at it's normal rate
(1)
(2)
----------------------------
(2)
(2)
and
(1)
---------------------
Substitute (1) into (2)
(2)
(2)
(2)
(2)
(2)
(2) ( figured out by noting: )
( can't use negative speed )
The car's speed in 25 km/hr
-------------------------
check:
(1)
(1) hrs
and
(2)
(2)
(2)
(2)
OK

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