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A swimming pool can be emptied in 24 hours using 2 hoses. How long it will take to drain the same pool using 3 similar hoses
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The rate of two hoses working simultaneously (1 + 1) is 
of the pool volume per hour.
Hence, the rate of one (each, single) hose is 
of the pool volume per hour.
Then the rate of 3 hoses working simultaneously (1 + 1 + 1) is 
= 
.
Therefore, the three hoses will take 16 hours to drain the pool, working simultaneously.
