book Maths Puzzle Numerical Ability

I am taking a 240 mile trip, It takes me 4 hours. During the second 2 hours of the trip, I average 20 miles less than I did in the first 2 hours. What is my average speed during t

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how i found the perimeter of an isosceles triangle? I need help understanding how to write a function in linear equation form. For example, I need to write something to describe "the number of cases handled per person is a function