# Driving theory questions

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You are driving at 90 km/h. How many metres does the car travel in 4 seconds?

 Colour codes for the figures (easier to keep track of them) Current speed 90 km/h Time 4 seconds Metres per second (to be calculated) X m/s

## Method 1

Convert km/h to m/s:

• 90 / 3.6 = 25 m/s

How many metres do you travel?

• 25 * 4 = 100 metres

3.6 is a fixed figure for converting km/h to m/s. It is difficult to divide by 3.6 in your head. A tip is to first divide by 3 and then by 4. You then take a number that is between the answers you get (the margins between the answer options are so large that closer accuracy is not required).

## Method 2

Strike the zero in km/h:

• 90 = 9

Convert km/h to m/s:

• 9 * 3 = 27 m/s

How many metres do you travel?

• 27 * 4 = 108 metres (closest to the answer 100)

Multiplied by 3 is a fixed figure for making approximate conversions from km/h to m/s.

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