Two pipes

How long will it take to fill the pool using both supply pipes if the first pipe alone fills it in 4 hours and the second pipe takes 9 hours longer than both pipes running together?

Final 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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You need to know the following knowledge to solve this word math problem:

algebraarithmeticbasic operations and conceptsUnits of physical quantitiesthemes, topicsGrade of the word problem

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