exam Maths Puzzle Numerical Ability

A car dealership has been selling new cars for $600 over the selling price. Sales have been 80cars/month. Due to inflation the $600 is increasing. For every $10 increase they will

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Greatest common factor
-18a^3,3a^4 At 10:00 a.m, a car leaves a house at a rate of 60 mi/h. At the same time, another car leaves the same house at a rate of 50 mi/h in the opposite direction. At what time will the cars be 330 miles apart?