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?
Please help and show how you got the answer
45
To find the rate of speed, we need to use the formula: speed = distance / time.
a. To find Lisa's rate of speed downstream, we will use the given distance of 2 miles and the time of 20 minutes. But first, we need to convert the time to hours, since the speed is usually measured in miles per hour.
20 minutes is equal to 20/60 = 1/3 hour.
Therefore, Lisa's rate of speed downstream is: 2 miles / (1/3 hour) = 2 * 3 = 6 miles per hour.
b. To find Lisa's rate of speed upstream, we will use the given distance of 2 miles and the time of 1 hour.
Therefore, Lisa's rate of speed upstream is: 2 miles / 1 hour = 2 miles per hour.
c. Now, let's suppose Lisa's speed rowing upstream was 4 miles per hour. We need to find how long it would have taken her to travel 2 miles.
Using the formula: time = distance / speed, we can plug in the given values:
time = 2 miles / 4 miles per hour = 0.5 hours.
Therefore, it would have taken Lisa 0.5 hours (or 30 minutes) to travel 2 miles upstream at a speed of 4 miles per hour.