Speed, distance and time

Objective. Calculate speed, distance or time from the other two.

1. Learn
2. Worked example
3. Practice
4. Feedback
5. Continue

Learn: the key idea

Speed = distance ÷ time. Rearranged: distance = speed × time and time = distance ÷ speed. Units must match — km with hours gives km/h.

Worked example

A car travels 150 km in 2 hours 30 minutes. Find the speed.

1 $2 h 30 min = 2.5 hours.$
2 $150 \div 2.5 = 60.$

Answer: 60 km/h

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Common mistake. Writing 2 hours 30 minutes as 2.3 hours.

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