Question
Pipe X can fill a tank in 15 hours and pipe Y in 30
hours. If both the pipes are opened in an empty tank, how much time will they take to fill it?Solution
Let the capacity of tank be 30 litres (LCM of 15 and 30)Efficiency of 'X' = (30/15) = 2 litres/hourEfficiency of 'Y' = (30/30) = 1 litres/hourRequired time = 30 ÷ (2 + 1) = 10 hours
More Pipes and cisterns Questions
Find the wrong number in the given number series.
120, 126, 138, 162, 220, 306
217Â Â Â Â 210Â Â Â Â Â 236Â Â Â Â Â 299Â Â Â Â Â 423Â Â Â Â 640
...112, 222, 440, 872, 1717 , 3424
In each of the following giving number series, a wrong number is given. Find out the wrong number?
82, 81, 86, 110, 168, 287
- 78, 86, 71, 95, 60, 112
2100, 2140, 2186, 2240, 2300, 2372
9, 10, 12, 18, 42, 160
A-5,  A,  35,  52, 78, 115
Find the wrong number in the given number series.
233, 206, 183, 152, 125, 98
Find the wrong number in the given number series.
2, 4, 12, 48, 120, 1440
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