Answered

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Onepipefillsastoragepoolin20hours.Asecondpipefillsthesamepoolin15hours.Whenathirdpumpisaddedandallthreeareusedtofillthepool,ittakesonly6hours.Findhowlongittakesthethirdpipetodothejob (byitself).

Sagot :

jay71212

Answer:

20

Step-by-step explanation:

If the 3rd pipe takes x hours,

1/6 = 1/20 + 1/15 + 1/x

x = 20

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