GCSE Secondary Maths Age 13-17 - Number: Average Speed - Explained

The video tutorial explains how to solve a distance, speed, and time problem by calculating the maximum possible speed. It involves understanding and applying the concepts of upper and lower bounds to determine if Kirstie's average speed could have exceeded 80 km/h. The tutorial provides a step-by-step method for converting units and performing calculations, emphasizing the importance of accuracy and methodical problem-solving.

What is the length of the road Kirsty drove along, and how is it rounded?

How long did it take Kirsty to drive along the road, and what is the rounding applied to this time?

What is the average speed limit for the road Kirsty drove on?

Explain how to calculate Kirsty's average speed using the distance and time.

What are the upper and lower bounds for the distance Kirsty drove?

What are the upper and lower bounds for the time taken by Kirsty?

Based on your calculations, could Kirsty's average speed have been greater than 80 kilometres per hour? Explain your reasoning.