The Footlocker employee, George, earns a 15% commission on all the Air Jordan's they sell in the store. He sold 35 pairs of Jordan's in one day for a tota of $6,300.

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.