exam Maths Puzzle Numerical Ability

I need to solve the equation:

5-x 13
_=
17 34

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exam Other Question

The sail area-displacement ratio S provides a measure of the sail power available to drive a boat. For a boat with a displacement of d pounds and a sail area of A square feet
S=16 A boat travels at a rate of 15 kilometers per hour in still water. It travels 60 kilometers upstream in the same time that it travels 90 kilometers downstream. What is the rate of