Solve.Three brothers need to paint the fence surrounding their family property. If they painted alone it would take the youngest brother 9h hours to paint it, the middle brother 5h hours, and the oldest brother 2h hours. How long will it take to paint the fence if they work together?
A. 
h hr
B. 
h hr
C. 
h hr
D. 
h hr
Answer: A
Mathematics
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