Skyler runs a new personal best in the 100-metre sprint. Her average speed over the course of the race is 8.5 metres per second. How long,to 2 decimal places, does it tale her to run the race?
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Speed Distance Time Questions, Worksheets and Revision
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What you need to know
Speed Distance Time
Speed is a measure of how quickly something moves, so it is calculated by dividing distance by time.
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Rearranging formulae
Units and conversions
Speed Distance Time Formulae
Speed, distance and time are all related by the formulae,
s = \dfrac{d}{t}s=
t
d
where ss is speed, dd is distance, and tt is time. You can rearrange this formula to find the other two, for example, if we multiple both sides by tt and divide both sides by ss, we get,
t = \dfrac{d}{s}t=
s
d
So, we can calculate the time by dividing the distance by the speed.
Typically, we measure distance in metres (mm), kilometres (kmkm), or miles, and we measure time in seconds (ss), minutes (mins) or hours (hh). As a result, the units we use to measure speed are compound units e.g m/sm/s or km/hkm/h
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