8.5 race

This question type involves starting from the same point and ending at the same point. Concepts used are DST triangle, head starts, catching up and speed difference.

question 1*

question 2*

Devi and Laura took part in a cycling competition. Devi’s average speed was 40 m/min. 
When Devi completed the journey in 45 minutes, Laura still had 900 metres to cover.
a) What was the distance of the cycling competition?
b) What was Laura’s average speed?

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question 9***