Arectangular plot of farmland will be bounded on one side by a river and on the other three sides by a single-strand electric fence. with 1800 m of wire at your disposal, what is the largest area you can enclose, and what are its dimensions?

Atourist boat is used for sightseeing in a nearby river. the boat travels 2.4 miles downstream and in the same amount of time, it travels 1.8 miles upstream. if the boat travels at an average speed of 21 miles per hour in the still water, find the current of the river.