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Measures

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Speed, distance and time

Speed is worked out by dividing the distance travelled by the time taken:

Speed = Distance divided by Time
Question

If you travel at 70 km in 2 hours. What is your average speed?

Answer

Speed = distance ÷ time

Speed = 70 ÷ 2 = 35 km/h

The distance in km and the time in h, so the units for speed are km/h.

If you know the speed, you can work out the time or the distance by re-arranging the equation.

speed = distance ÷ time

distance = speed × time

time = distance ÷ speed

Question

If you walk for 1 1/2 hours at an average speed of 4 miles/h. How far will you have walked?

Answer

Speed = distance ÷ time

Distance = Speed × Time

Distance = 4 × 1.5 = 6 miles

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