4 boats math equation?

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lary, mo , jo standing on 1 side of lake. have 4 boats can use. each boat different color , moves @ different speed. red boat can cross lake in 2 min, blue boat in 3 min, green boat in 7 min , yellow in 10 min. challenge eachother contest. goal 1 person 4 boats other side of lake in 21 minutes. here rules: 1. way 1 side of lake other driving boats- walking around lake not allowed. 2. each boat can driven across lake individually or towing boat. 3. towing more 1 boat @ time not allowed. if boat towed, time cross lake determined speed of slowest boat. example, if red boat (2 min) tows green boat(7 min) take 7 minutes cross lake. mo says can in 21 minutes. how it?

lary, mo , jo standing on 1 side of lake. have 4 boats can use. each boat different color , moves @ different speed. red boat can cross lake in 2 min, blue boat in 3 min, green boat in 7 min , yellow in 10 min. challenge eachother contest. goal...


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