SOLUTION: it takes 6 students 1hour to sweep their school compound. How long will take 15 students to sweep the same compound?

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Question 889134: it takes 6 students 1hour to sweep their school compound. How long will take 15 students to sweep the same compound?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
"Sweep the compound" is one job.
Each student works at a rate of r.
Let t = time in HOURS for the 15 students to do the job.

6r%2A1=15r%2At;
Solve for t.