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Strike441 [17]
3 years ago
5

An inlet pipe on a swimming pool can be used to fill the pool in 15 hours. The drain pipe can be used to empty the pool in 20 ho

urs. If the pool is \frac{1}{3} filled and then the inlet pipe and drain pipe are opened, how many more hours would it take to fill the pool? Round your answer to two decimal places, if needed.
_____________ hours
Mathematics
2 answers:
Katen [24]3 years ago
5 0

Answer:

  • 40 hours

Step-by-step explanation:

  • Rate of filling is 1/15
  • Rate of draining is 1/20

<u>If both lines are open the rate of filling is:</u>

  • 1/15 - 1/20 = 4/60 - 3/60 = 1/60 per hour

Since tank is 1/3 full we need to fill the remaining 2/3 of it.

<u>Time required:</u>

  • 2/3 : 1/60 =
  • 2/3*60 =
  • 40 hours
Delicious77 [7]3 years ago
3 0

Answer:

30 hours i think

Step-by-step explanation:

#CarryOnLearning

hopeithepls

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