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回复：回复：how many left?

康MM 2010-01-13 08:19:10 ( reads)

8 is the right answer. You first make three trips of 3 miles, and then 2 trips of 5 miles

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fruitbasket

2010-01-13 12:45:10

回复：回复：回复：how many left?

康MM

2010-01-13 17:02:17

write out how you get 8, and that would be a proof

Jinjing

2010-01-13 17:55:32

回复：write out how you get 8, and that would be a proof