exam Maths Puzzle Numerical Ability

the shortest distance from the centre of a circle to a chord is 5 cm. find teh radius (2d.p.) of the circle if the chord is 3*2 times longer than the radius.

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exam Other Question

This is not from a textbook. I do not understand the AND / OR in the following equations:

4x-6_>2 AND 5x-4>21 _> is less than or equal to

2-4x<6 OR 3-x>9 A steamboat travels 8 km/h faster than a freighter. The steamboat travels 88 km in the same time the freighter travels 53 km. Find the speed of the steamboat.