ten men can excavate 15 cu. meter of drainage open canal in 7 hours.three men can back fill 10 cu. meter in 4 hours.how long it take 10 men to excavate and back fill 20 cu. meter in the same project a.15 b.12 c.9.9  d.7.5

Algebra: Structure And Method, Book 1
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ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter3: Solving Equation And Problems
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ten men can excavate 15 cu. meter of drainage open canal in 7 hours.three men can back fill 10 cu. meter in 4 hours.how long it take 10 men to excavate and back fill 20 cu. meter in the same project

a.15

b.12

c.9.9 

d.7.5

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