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First, we need to find 3/5 of $3,000 for the gasoline and motel rooms.
3/5 * $3,000 = $1,800
Then we need to find 1/2 of the remainder for the meals.
$1,800 / 2 = $900
Therefore, Molly's family plans to spend $900 on meals. Answer: \boxed{\text{(B)}\ $900}.