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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?

Option :

Answer:Option 1

Explanation:

Solution:
Let the required number of working hours per day be x.
More pumps, Less working hours per day (Indirect Proportion)
Less days, More working hours per day (Indirect Proportion)
Pumpu 4:3Days1:2}::8:x

4×1×x=3×2×8x=(3×2×8)(4)x=12



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