book Maths Puzzle Numerical Ability

Sally traveled in a boat up the river, against its 1 km/h current and back again in 55 minutes. She traveled 5 km in each direction. What is the boat's rate in still water?

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book Other Question

The vertices of a right triangle are (-12,8), (24,8), and (24,-7). Find the lenght of the hypotenuse of the triangle. Two consecutive even numbers were multiplied. After 2 was added to each of the numbers, their product was increased by 136.

What are the 2 numbers?