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UKMT Junior Mathematical Challenge, 2021

Algebra Difficulty 2.0 Junior Find the answer United Kingdom

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?

(A) $2$ (B) $2\frac{1}{2}$ (C) $3\frac{1}{4}$ (D) $4$ (E) $4\frac{1}{2}$

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