exam Maths Puzzle Numerical Ability

At noon, the hot air ballon headed north at 8 miles per hour. Three hours later, the glider headed south from the same location at 16 miles per hour. At what time will the hot air ballon be 168 miles from the glider?

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exam Other Question
If the amount of mercury in a polluted lake is 0.40 HG/mL, what is the total mass of mercury in kilograms in the lake. The lake has a surface area of 25 square miles and an average I was given an equation of a line and a point and told to determine whether the point is on the line using substitution. Heres two problems


y=x-4;A(5,1)




y=4x+2;A(1,6)