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The calculation below gives you an answer in Feet, which is correct with the highway code. But for some reason the DSA has not used these distances and converted the metres answer into feet so the . In the test they will give answers in Metres and Feet. So if you use the calculation use the answer closest to your answer Here is a link to the highway code braking distance chart
Braking Distances
Calculate the overall
stopping
distance
Start at 20mph and times
by 2, which gives 40, so 40ft. For every 10mph you increase add 1/2 to the multiplier.
E,G,
20 MPH X 2.0 = 40ft
To Calculate just the Braknig distance subtract the MPH from your answer E.G Braking Distance

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