exam Maths Puzzle Numerical Ability

I'd be greatful if someone can give me some guidance on this question.

A particular harmonic drive for use ina robot jointed arm has one less tooth on the flexible spline than o

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what number increased by 1/2 of itself equals 54 A car traveling 88km/h is passed by another car going the same direction at a constant speed. After 30 seconds the two cars are 600 meters apart. Find the speed of the second car.