B:180 degrees because a circle is 360 degrees and half of 360 is 180. I'm learning this too lol
Answer:
4 is answer
Step-by-step explanation:
y=2 x=6-2 x=4
3 pipes take 12 hours
⇒ In 1 hour, the 3 pipes can fill 1/12 of the pool
2 of the pipes take 18 hours
⇒ in 1 hour, the 2 pipes can fill 1/18 of the pool
In 1 hour, the third pipe alone can fill :

Time needed :

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Answer: It will take 36 hours for the third pipe to fill the pool.----------------------------------------------------------------------------------------