document.write( "Question 1104400: Two pumps can fill a water tank in 60 minutes when working together. Alone, the second pump takes 9 times longer than the first to fill the tank. How long does it take the first pump alone to fill the tank? \n" ); document.write( "
Algebra.Com's Answer #719138 by jorel1380(3719)\"\" \"About 
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Let n be the time it takes for the first pump alone. Then, the second pipe would be 9n. So:
\n" ); document.write( "1/n+1/9n=1/60
\n" ); document.write( "180+20=3n
\n" ); document.write( "n=200/3 minutes for the first pump working alone
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