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A Boy, a Girl, a Dog, and a Bicycle (Posted on 2004-02-03) Difficulty: 3 of 5
A boy, a girl and a dog go for a 10 mile walk. The boy and girl can walk at 2 mph and the dog can trot at 4 mph.

They also have a bicycle which only one of them (including the dog!) can use at a time.
When riding, the boy and girl can travel at 12 mph while the dog can pedal at 16 mph.

What is the shortest time in which all three can complete the trip?

See The Solution Submitted by DJ    
Rating: 4.1818 (11 votes)

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A Boy, a Girl, a Dog, and a Bicycle | Comment 18 of 26 |
I hope that the answer is 5 hours. Otherwise what is the purpose of taking a walk. If this were a race where it didn't matter if everyone separated, we could plot out the shortest time. Before I do that, I want to eliminate the obvious.
  Posted by Chuck Horn on 2004-02-11 14:25:17
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