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Richard mows 13 of his yard in 12hour. At the same rate? how much did he mow in 1 hour?

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I imagine that the problem is that he mows 1/3 of his yard in 12 hour so in 1 hour he will mow (1/3)/12 = 1/36 0f the yard per hour. or the other answer may be 13 units of his yard divided by 12 hours gives 1.083 units of yard per hour.


I'm guessing it's 1/3 of the yard in 1/2 hour.
Thank you Philip, it is another way  of focusing the problem!!!!!!!!!