Two pipes

How long will the pool be filled with a double supply pipe if it takes the pool to fill the first pipe by 4 hours longer and the second pipe 9 hours longer than both pipes open at the same time?

Correct result:

t =  6 h

Solution:

t1=t+4 t2=t+9  t (1t1+1t2)=1 t (1t+4+1t+9)=1  t (t+9)+t (t+4)=(t+9) (t+4) t2=36  t>0  t=36=6 h



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