3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?
Created: 8 months ago |
Updated: 5 months ago
best des
3 pumps working in 2days =8×2= 16 hr
Means they can empty a tank in 16 hr .
3pumps 1 hr work = 1/16
1pumps 1 hr work =1/3×16
4pumps 1hr work =4×1/3×16= 1/12
Hence they will empty the tank in 1/ 12 hr
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