The way you round numbers is to look at the number immediately to the right of the place you want to round. In this case, you're looking at the number 4 because that is the next number after the first decimal place. If that number is 5 or greater, you round up to the next number; if it is less than 5 you stay the same. 4 is less than five so you leave the number 1 as a 1 and have 3.1 hours.
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300
300
To one sig fig, 300 To two sig figs, 310 To three sig figs, 314
The prime factorization of 314 is 2 x 157.
314/1 is one possible answer.