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 answer:

t =  6 h

Step-by-step explanation:

t1=t+4 t2=t+9  t (t11+t21)=1 t (t+41+t+91)=1  t (t+9)+t (t+4)=(t+9) (t+4) t2=36  t>0  t=36=6 h



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