Lily swims for 5 hours in stream that has a current of 1 mph. she leaves her dock, swims upstream for 2 miles and then swim back to her dock. what is her swimming speed in still water?

Swimming speed in still water is approximately 1.5 mph

Step-by-step explanation:

Given the speed of the current = 1 mph

distance she swims upstream =2 miles,

the total time = 5 hours.

She swam 2 miles upstream against the  current and 2 miles back to the dock with  the current. The formula that relates  distance, time, and rate is

Let x be the speed in still water.

Then  her speed with the current is x + 1, and

her speed against the current is x – 1.

Total time is equal to 2 miles with upstream and 2 miles downstream.

Now Using quadratic formula to solve above equation we get;

Since speed must be positive, Hence speed of still water is about 1.5 miles per hour.

555.99.

step-by-step explanation:

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