posted by Ted .
A group of students have volunteered for the student council car wash. Janet can wash a car in m minutes. Rodrigs can wash a car in m-5 minutes, while Nick needs the same amount of time as Janet.If they all work together, they can wash a car in about 3.23 minutes. How long does Janet take to wash a car?
pls help. I tried it couple of times but did not get the answer.