Answer:
5mph
Step-by-step explanation:
Let speed of boat in still water is s.
Distance proportional to speed
90/10 = (s+ 4)/(s - 4)
=> 9s - 36 = s + 4
=> 8s = 40
=> s= 5 mph
:-)
17
4.68
Remember to line up the decimal point. Subtract as ordinarily.
8.31
-3.43
--------
4.68 is your answer
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Answer:d
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