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 long and the second pipe 9 hours longer than both pipes open simultaneously?

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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