book Maths Puzzle Numerical Ability

A motorboat goes 5 miles upstream in the same time it requires to go 7 miles downstream. The river flows at 2 miles per hours. What is the speed of the boat in still water?

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I need to know the equation for the following:

Kathryn drove her rig 5 hours before dawn and 6 hours after dawn. If her average speed was 5 miles per hour more in the dark and s 4. Find the point on the positive y-axis that is a distance 5 from the
point P(3, 4).