book Maths Puzzle Numerical Ability

How do you figure out the volume of a sphere which has a diameter of 2m

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book Other Question

Mark leaves the house for school walking at the rate of 4 kph. Two hours later Joyce follows Mark at 4.5 kph. How long will it take Joyce to overtake Mark? a load of 5kg stretches a spring to a length of 24 cm. a load of 8kg stretches it to a length of 30cm. find the length of the spring when there is no load.