6 lumberjacks can cut down 15 mahogany trees in 2 hours. How much longer will it take 8 lumberjacks to cut down 35 trees working at the same rate

Answer 1

15 trees take 12 man-hours, so
35 trees take 35/15 * 12 = 28 man-hours, or 7/2 hours for 8 men

Answer 2

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Answer 3

6 lumberjacks can cut down 15trees/2hrs = 7.5 trees/hr.
35trees * 1hr/7.5trees * 6/8 = 3.5 hrs. = Time for 8 men to cut down 35 trees.
3.5-2 = 1.5 hrs. longer.