exam Maths Puzzle Numerical Ability

How do I express this as a simplified rational number 10/3-5/2

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exam Other Question

Given the circumference of a circle as 50 pi find the diameter of the circle.
JOhn does a task in 30 minutes, Jennifer does in 45 minutes and Caryn in 1 1/2 hour. How long would it take for the three of them to do it if they do it together?