book Maths Puzzle Numerical Ability

how i found the perimeter of an isosceles triangle?

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The sum of a certain number and second number is -42. The first number minus the second number is 52. Find the numbers. 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