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: Better late than never... by Jils)

In this problem, if *anyone* gets there sooner than another, then an argument can be made showing that the 'extra' time could have been better used to move the bike to another.

They should all finish simultaneously.

Posted by SilverKnight on 2004-02-04 06:23:12