exam Maths Puzzle Numerical Ability

Jonah's speed on his drive to work in the morning averages 20 miles per hour faster than his speed on the return trip in the evening. It takes him 1/4 hour to get to work and 1/2

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exam Other Question
Let f(x,y)=x^2-xy. Determine a simplified expression for f(x,x-y). Find three consecutive positive integers such that the product of the first and third, minus the second, is 1 more than 4 times the third.