Question
It takes 3 men to dig 2 identical trenches in 5 hours.If all the men work at same rate,how long will it take 5 men to dig 7 of these trenches?
Answers
Steve
2 trenches = 3*5 = 15 man-hr
7 trenches = 7/2 * 15 = 105/2 man-hr
(105/2 man-hr) / (5 man) = 21/2 hr
or, 10 hr 30 min
7 trenches = 7/2 * 15 = 105/2 man-hr
(105/2 man-hr) / (5 man) = 21/2 hr
or, 10 hr 30 min
Rania shezad
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