Ken paid $60 x 3 = $<<60*3=180>>180 to rent a sailboat for 3 hours in a day
Aldrich paid $80 x 3 = $<<80*3=240>>240 to rent a ski boat in 3 hours in a day.
So Aldrich paid $240 - $180 = $<<240-180=60>>60 more to rent a ski boat than Ken to rent the sailboat each day.
Therefore, it cost Aldrich $60 x 2 = $<<60*2=120>>120 more to rent a ski boat than Ken to rent the sailboat in two days.
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