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?

(In reply to re(2): solution by dave domingo)

Dave,

Don't get me wrong... I think Excel is a wonderful tool to solve problems... (particularly simultaneous equations with constraint problems).

And you may very well have solved it, on your own, with or without Excel....

I just meant to point out that a "solution" should ideally provide enough information in a clear manner to enable the reader to replicate the thought process/method of solving.

- SK

Posted by SilverKnight on 2004-02-04 13:02:53