David swam 400 metres in 9 minutes and 10 seconds.
He assumes he can swim 1500 metres at the same speed.
Work out how long it would take David to swim 1500 metres.
Give your answer in minutes and seconds to the nearest second.
David actually swims faster as he warms up, meaning his speed increases.
How does this affect your answer to part (a)?
52 exam-style questions on AQA GCSE Maths Speed and Density. Each one has a worked solution and a mark scheme showing where the marks go.