AlgebraEasy–MediumTime from odometer readings and a speed
Algebra practice question
A car's odometer reads 24,150 kilometres at the start of a journey and 24,480 kilometres at the end. If the car averaged 55 kilometres per hour, how many hours did the journey take?
Answer: 6
Distance = 24,480 − 24,150 = 330 km. Time = 330 ÷ 55 = 6 hours.
Common wrong answers
- If you answered 5
- 5 comes from an arithmetic slip; 55 × 5 = 275, not 330.
- If you answered 330
- 330 is the distance, not the time.
- If you answered 445
- 445 comes from 24,480 ÷ 55, using the final reading as the distance.
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