SOLUTION: It takes Kenny 3 hours to pedal a tamdem bicycle from one end of town to the other. If Dolly pedals with him, they can make the trip in 2 hours. How long would it take Dolly to tra

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Question 460119: It takes Kenny 3 hours to pedal a tamdem bicycle from one end of town to the other. If Dolly pedals with him, they can make the trip in 2 hours. How long would it take Dolly to travel from one end of town to the other alone?

Found 2 solutions by Alan3354, richard1234:
Answer by Alan3354(69443) About Me  (Show Source):
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It takes Kenny 3 hours to pedal a tamdem bicycle from one end of town to the other. If Dolly pedals with him, they can make the trip in 2 hours. How long would it take Dolly to travel from one end of town to the other alone?
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This is not a good problem. The implication is that 2 people can move faster than one person alone, or that a posse on horses is faster than one horse.
It's better than the one about the bicycle going upwind and downwind, tho.
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1/3 + 1/D = 1/2
1/D = 1/2 - 1/3 = 1/6
Dolly alone takes 6 hours is the expected answer.

Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
I agree with the other tutor, bicycling is not "additive"; the fact that two people are bicycling does not mean that their respective speeds add up. Unless of course one becomes tired and they switch off occasionally. Poorly designed problem indeed.