Andrew ran 3.6 miles in 15 minutes and 30 seconds.
He assumes he can run 8 miles at the same speed.
Using this assumption, Andrew calculates that it would take 34 minutes and 27 seconds to run 8 miles.
Andrew's speed actually decreases the further he goes.
How does this affect your answer to part (a)?
203 exam-style questions on OCR GCSE Maths Speed and Density. Each one has a worked solution and a mark scheme showing where the marks go.