# algebra

hi!
im having some problems with my word problem.

Ann regularly swam .4 km in 20 min at the school pool. Swimming in a river against the current, she swan .25 km in the same time it took Ann to swim .75 km with the current. Dind the speed of the current and the time it took ann to swim.

1. 👍
2. 👎
3. 👁
1. First find the speed at which Ann swims.
0.4km/20min = 0.02km/m

Let C be the speed of the current

Ann's upstream time is:
0.25km/(0.02km/m - C)

Ann's downstream time is:
0.75km((0.02km/m + C)

The problems states that they are equal.
0.25km/(0.02km/m - C) = 0.75km/(0.02km/m + C)

Solve for C. It will be in km/m.

1. 👍
2. 👎
2. Substitute the value you found for C into either equation to get the one way time. The problem seems to indicate that you need the total time. That is the time it took Ann to swim up and back. Be sure to indicate that time is for one direction and the total time is twice that.

1. 👍
2. 👎

## Similar Questions

1. ### Science/Math

Word Problems pages 18-19 A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting

2. ### Math

A swimmer swam north at 1.75 m/s across a current running from west to east at 2 m/s. She swam for 20 s. How far did she travel, rounded to the nearest tenth of a metre? A) 75 m B) 53.2 m C) 2.7 m D) 26.6 m

3. ### Math

0 Tutors Online Right Now Math 20-1 Help What is this? What is tutors online right now mean? I need help What are points? See all FAQ Aron is training for a 10 km marathon swim in 19 weeks. Each week, his training plan includes a

4. ### math

2.-The longest one-word name of any place in America is Chargoggagoggmanchauggagoggchubunagungamaugg.This name for a lake near webster, Massachusetts, is 45 letters long. It is a Native American name that means "You fish on you

1. ### Chem

I've been having trouble setting up word problems. Here is one problem I need help with. How many Bromide ions are in a sample of CaBr2 that has a mass of 10.0g?

2. ### math

suppose that we agree to pay you 8cents for every problem in this chapter that you solve correctly and fine you 5cents for every problem done incorrectly, if the end of 26 problems we do not you each other any money, how many

3. ### math

The area of a rectangle of length l and width w is given by the formula A = lw. Ann's backyard is rectangular with a length of 36.8 yards and a width of 27.9 yards. Find the area of Ann's backyard. 36.8x27.9=1026.72area of ann's

4. ### statistics

A local country club has a membership of 600 and operates facilities that include an 18-hole championship golf course and 12 tennis courts. Before deciding whether to accept new members, the club president would like to know how

1. ### Math

Ann has \$198 more than her sister. After her mom gives Ann \$20 and her sister \$60, Ann has twice as much money as her sister. How much money did Ann have at first?

2. ### thx 4 the help roger

thx 4 the help i got the steps You're welcome and I'm glad you understood the steps. Now use that strategy with your other word problems. Identify what the variable(s) are, convert them to equations, then solve the equations.

3. ### Algebra

Here is the problem: A two-digit number is eight times the sum of its digits.When the number is added to the number obtained by reversing the digits,the sum is 99. Find the original number. Please explain hot to solve it and it

4. ### Math

Ann had \$198 more than her sister. After their mother gave Ann \$20 and her sister \$60, Ann had twice as much money as her sister. How much money did Ann have at first.