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Answer:

300:1

Step-by-step explanation:

900:3 = 300:1

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Answer: 300 per hour

Step-by-step explanation:

If 900 is for 3 hours than you got to find the ratio for 1. So just divide 900 by 3 and you get the answer 300. To check your answer multiply 300 by 3 and you get 900. :)