SOLUTION: Luis can drive 3 times as fast as Rico can ride his bicycle. If it takes Rico 4 hours longer than Luis to travel 72 miles, how fast can Rico ride his bicycle?

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Question 1022431: Luis can drive 3 times as fast as Rico can ride his bicycle. If it takes Rico 4 hours longer than Luis to travel 72 miles, how fast can Rico ride his bicycle?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39626)   (Show Source): You can put this solution on YOUR website!
            rate      time       distance
LUIS        3r          t         72
RICO         r         t+4        72

R rate, T time, D distance;
Basic Travel Rate Rule is RT=D.


Solve the system.
Answer by MathTherapy(10556)   (Show Source): You can put this solution on YOUR website!

Luis can drive 3 times as fast as Rico can ride his bicycle. If it takes Rico 4 hours longer than Luis to travel 72 miles, how fast can Rico ride his bicycle?
Let Rico's speed be S

Then Luis' is: 3S

We then get:  

 ------- Multiplying by LCD, 3S



144 = 12S

S, or Rico's speed = , or  

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