exam Maths Puzzle Numerical Ability

a truck traveling at a constant rate of 45mph .one hour later a car traveling at a rate 60mph same direction on highway.howlong will it take for the car to catch up to the truck, if both vehicles continue in same direction?

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exam Other Question

How many liters of a 10% alcohol solution must be mixed with 70 liters of a 90% solution to get a 30% solution?

Thanks in advance for your help! Hi, I tried to solve for 5x^2=3x+2 and thought the answer is x=2/5 and x=-2.
Also, I tried to solve 3x^3 +2x^2=x and came up with x=0, 1/3, -1. I am not
sure of these answers. Can you please help me? Thank you!