10 man, working 6 hours a day can complete a work in 18 days. How many hours a day must 15 men work to complete the same work in 12 days ?

10 man, working 6 hours a day can complete a work in 18 days. How many hours a day must 15 men work to complete the same work in 12 days ? Correct Answer 6

M1 × T1 / H1 = M2 × T2 /H2 10 × 18 /6 = 15 × 12 /H2 H2 = 15 × 12 / 10 × 3 H2 = 6
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