A speedboat moves at a rate of 25 km/hr in still water. How long will it take someone to ride the boat 87 km downstream if the river's current moves at a rate of
4 km/hr?

What is r i 4.5+10r=-6.5 with work pls

What is the inverse of f(x) = 6x -24

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.