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?
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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.