ally2377 ally2377

07-08-2019
Mathematics

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Need help in question number 23 ONLY pleaseee!!

Need help in question number 23 ONLY pleaseee class=

Respuesta :

Аноним Аноним

07-08-2019

Answer:

3.6 hours.

Step-by-step explanation:

We work in terms of rates per hour:

1/9 + 1/6 = 1/x where x is the time for 2 pipes working together.

Multiply through by the LCD of 6, 9 and x ( which is 18x) :-

2x + 3x = 18

5x = 18

x = 3.6 hours.

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