What is the speed limit outside a city with no posted sign?
80 km/h
Where no limit is posted, the maximum is 80 km/h outside built-up areas (and 50 km/h inside cities, towns and villages). Always slow down further when conditions require it.
Why the other answers are wrong
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50 km/h
That is the unposted maximum inside cities, towns and villages. Once you are past the built-up area and still see no sign, the default rises to 80.
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90 km/h
Ontario has no 90 default. With no sign there are only two numbers to remember: 50 in built-up areas and 80 outside them.
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100 km/h
A limit this high only applies where a sign posts it. The question says nothing is posted, so you fall back to the default of 80 outside built-up areas.
Quick way to remember
Open road, not a built-up area. The default is higher than in town.
Based on the official Ontario MTO Driver's Handbook.
Reading it once is not enough
Drill this question in a scored round and find out what else you are shaky on.
Practise Rules of the Road: The Basics