It will take 12 hours for 15 men to do same job.
How to determine this?
When amount of hour ∝ 1/number of men
When H represent Hour
And M represent the number of men
k to represent the constant
H = k/M as it is inversely proportional
It takes 10 men 18 hours to repair a road
18 = k/10
k = 18 × 10
k = 180
How long will it take 15 men?
When k = 180
H = k/M
H = 180/15
H = 12 hours
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