book Maths Puzzle Numerical Ability

A bayline Cruises sightseeing boat travles 36 miles upriver and 36 mi. back in 5 hours. The speed of the river's current is 3 mph. Find the speed of the boat in still water.

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I am confused! Please help!
the revenue R from selling x units of a certain product is given by
R=20(20-0.2x)
Find the number of units that must be sold to produce a revenue of find the slope of the line through the points (2,5) and (-2,3)