Question 1130664
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<pre>
Let x be the boat speed in still water (in miles per hoyr).
Let y be the speed of the current.


Then from the condition


x + y = 24/2 = 12,    (1)
x - y = 24/4 =  6     (2)


To solve the system, add the equations. You will get

2x = 12 + 6 = 18  ====>  x = 18/2 = 9.


<U>Answer</U>.   The boat speed in still water is 9 mph.
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Solved.