Book Maths Puzzle Time Distance and Speed

Joan rowed her boat across Lake Placid and back in 3 hours. Her rate returning was 2 mph less than the rate going. The distance each way was 7 miles. Find her rate each way.

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Book Other Question

I am having a hard time with this one, 4-7d=13-4d, could you provide a little help, every answer I come up with does not fit. I come up with d=9/3 everytime, but that does not, fit into the equation. Unless I am doing that step wrong also...Thank you... Paul weight 250 pounds,three times mack's weight is twice Paul, how many pounds does Paul weight? how many pounds does mack weight?