SOLUTION: Manuel can drive 4 times as fast as Carlos can ride his bicycle. If it takes Carlos 3 hours longer than Manuel to travel 80 miles, how fast can Carlos ride his bicycle?

Question 902878: Manuel can drive 4 times as fast as Carlos can ride his bicycle. If it takes Carlos 3 hours longer than Manuel to travel 80 miles, how fast can Carlos ride his bicycle?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Manuel can drive 4 times as fast as Carlos can ride his bicycle. If it takes Carlos 3 hours longer than Manuel to travel 80 miles, how fast can Carlos ride his bicycle?
let x=carlos' bike speed
4x=Manuel's driving speed
travel time=distance/speed
80/x-80/4x=3
lcd:4x
320-80=12x
12x=240
x=20
how fast can Carlos ride his bicycle? 20 mph
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