How do u solve this problem number 2

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2015-10-31 09:39:07

The answer is 30 40 and 60

2015-10-31 09:40:22

there are 6 space between 10 through 11 which is 6/6 the first answer would be 10 2/6 the second would be 10 3/6 the third one is 10 5/6

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