80 meters.

A change in speed will naturally affect the braking distance. The relationship between the change in speed and braking distance can be explained in the following manner: Braking distance changes with the square of the change in speed.

In this case, you know that the braking distance before the increase in speed is 5 metres. The speed is then multiplied by four (from 20 km/h to 80 km/h), which means the braking distance is multiplied by 4 squared, which is 16.

Braking distance at 80 km/h is therefore calculated as 5 metres x 16 = 80 metres.

The illustration below shows braking distances on dry roads at different speeds:

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