For this problem, you would use the formula distance =rate x time. You have the distance traveled, 2.4 miles. You have the time it took to travel that distance, 135 minutes. Now, you want to know the rate (how fast) it took to swim that distance.
d = rt
Now let's fill in your information
2.4 miles = r x 135 minutes
The first step is to convert 135 minutes into hours, so the answer will result in miles per hour (mph). 135 minutes divided by 60 minutes equals 2.25 hours. Let's rewrite the equation
2.4 miles = r x 2.25 hours
2.4 miles/2.25 hours = r
1.06 miles/hour = r
So, if someone swam 2.4 miles and it took them 135 minutes, the swimmer was swimming at 1.06 mph.
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27.9 miles per hour
130.6 miles per hour.
15.33333333333333333333mph
120 mph
It depends how fast you are going.