Lisa rowed her boat for two miles downstream. The trip took her 20 minutes. She then turned around and rowed back

the two miles. It took her one hour to row back upstream.
a. At what rate of speed did Lisa row downstream?
b. At what rate of speed did Lisa row upstream?
c.
Suppose Lisa’s speed rowing upstream was 4 miles per hour. How long would it have
taken her to travel two miles?

20min = 1/3 hr, so

2mi/(1/3 hr) = 6mi/hr downstream
2mi/1hr = 2mi/hr upstream

2mi/(4mi/hr) = 1/2 hr

It's not clear whether somewhere in all that you are to find Lisa's speed in still water, and the stream's speed...

To calculate the rate at which Lisa rowed downstream, we can use the formula Rate = Distance / Time.

a. To find the rate at which Lisa rowed downstream:
Distance = 2 miles
Time = 20 minutes = 1/3 hour

Rate downstream = Distance / Time = 2 miles / (1/3 hour) = 2 miles * 3/1 hour = 6 miles per hour.

Therefore, Lisa rowed downstream at a speed of 6 miles per hour.

b. To find the rate at which Lisa rowed upstream:
Distance = 2 miles
Time = 1 hour

Rate upstream = Distance / Time = 2 miles / 1 hour = 2 miles per hour.

Therefore, Lisa rowed upstream at a speed of 2 miles per hour.

c. If Lisa's speed rowing upstream was 4 miles per hour, we can use the same formula to find the time it would have taken her to travel two miles.

Rate upstream = 4 miles per hour
Distance = 2 miles

Time = Distance / Rate = 2 miles / 4 miles per hour = 1/2 hour = 30 minutes.

Therefore, it would have taken Lisa 30 minutes to travel two miles upstream if her speed was 4 miles per hour.