This is similar to Problem 11 from your Section 3.2 worksheet.

Maddy and Carl row their canoe $72$ miles downstream in $4$ hours. After a picnic, they row their canoe back upstream. After $3$ hours of rowing upstream, they only travel $18$ miles. Assuming that Maddy and Carl canoe at a constant rate and that the river's current is constant, find the speed at which Maddy and Carl row in still water.

Maddy and Carl row in still water. Be sure to include units.

Hint:

Hint: