Another interesting math puzzle…?

Three cyclists go out for the day. Two are on a tandem and one on an ordinary bicycle. Disaster struck when the ordinary bicyle was stolen while they were having lunch. They were left with the tandem and 20 miles to go. The tandem has to have two riders and the third person walks. Mary can walk a mile in 20 minutes, Ben in 30 minutes and George in 40 minutes. The tandem travels at 20 miles per hour no matter which pair is riding it. What is the shortest time for all three to get home?

Any answers, and any explanations?

Have fun... 10 points for the clearest explanation with answer.

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