It would be rounded to 60 if you're rounding to the nearest 10.
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Numbers such as this are rounded down if the end digit is 1 to 4 and rounded up if the end digit is 5 to 9. So, 55, 56, 57, 58 and 59 would be rounded up to 60. 60 is unchanged. 61, 62, 63 and 64 would be rounded down to 60. The number is therefore any number from 55 to 64 inclusive.
60
60
rounded down
3.5 can be rounded up to 4 or down to 3, most often it will be rounded up.