exam Maths Puzzle Numerical Ability

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Diameter of a circle. If the diameter of a circle 1.3 X 10^-12 meters, then what is its radius?

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exam Other Question

Two trains leave the depot at the same time, one traveling east and the other west. The speed of one train is 9mph slower than the other. If after 4 hours the distance between the trains is 196 miles find the speed of each train. Solve by completing the square.

x^2 - 16x + 63 = 0