JMC 2021 Challenge

10. The diagram shows a rhombus formed by joining each vertex of a square to the midpoint of a side of the square.

What fraction of the area of the square has been shaded?

12. The pupils in my class work very quickly. Jasleen answers four questions every **$30$** seconds and Ella answers five questions every **$40$** seconds.

Last week, Jasleen took exactly **$1$ **hour to answer a large set of questions.

How many minutes more than Jasleen did Ella take to answer the same set of questions?

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