22.

** Paddle Boat ** You paddle boat 8 miles upstream(against the current) and 8 miles downstream(with the current). The speed of the current is 1 mile per hour.

**a**. Write an

equation that gives the total travel time

*t * (in hours) as a

function of your average speed r(in miles per hour) in still water.

**b**. Find your total travel time if your average speed in still water is 3 miles per hour.

**c**. How much faster is your total travel time if you increased your average speed in still water to 3.5 miles per hour? Round your answer to the nearest tenth.

23

**Bike ride **You bike 50 miles from home. On your way back home, your average speed increases by 3 miles per hour.

**a**. Write an equation that gives total biking time

*t(in hours)* as a function of your average speed r(in miles per hour) when you are biking away from home

**b**. Find the total biking time if your bike away from your home at an average speed of 15 miles per hour. Round your answer to the nearest tenth.

**c**. How much longer is your total biking time if your bike from your home at an average speed of 12 miles per hour?

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