document.write( "Question 1099899: A water tank can be filled by three pipes separately in 20,30 and 6o minutes respectively.In how many minutes can it be filled by the three pipes acting together?
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Algebra.Com's Answer #714396 by ikleyn(53751) $\"\"$ $\"About$

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document.write( " of the job per minute is the rate of the 1-st tube.\r\n" );
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document.write( " of the job per minute is the rate of the 2-nd tube.\r\n" );
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document.write( " of the job per minute is the rate of the 3-rd tube.\r\n" );
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document.write( "The combined rate of work of all three tubes working together is  \r\n" );
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document.write( "     =  =  =  of the job per minute.\r\n" );
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document.write( "Hence, it will take 10 minutes for the three tubes to fill the tank working together.\r\n" );
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