document.write( "Question 976262: A pipe can fill tank in 140 hrs
\n" ); document.write( "B can fill in 210 hrs
\n" ); document.write( "C can empty the tank in 280 hrs
\n" ); document.write( "Wht will b the time required to fill the tank if all pipes wrk together..?
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Algebra.Com's Answer #597884 by josgarithmetic(39620)\"\" \"About 
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\"1%2F%281%2F140%2B1%2F210-1%2F280%29\" hrs. \n" ); document.write( "
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