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if 3 carts and 3 trucks could move a certain amount of coal in 15 days and if 4 carts and 2 trucks could move

if 3 carts and 3 trucks could move a certain amount of coal in 15 days and if 4 carts and 2 trucks could move it in 20 days how long would it take one cart to move the coal how long will it take 8 carts to move the coal

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