exam Maths Puzzle Numerical Ability

a motor boat goes 3 miles upstream in the same time required to go 5 miles downstream.if the rate of flow of river is 3 miles per hour,find the speed of the motorboat in still wate

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please help me solve this:

(x - 2y)(x + 2y)

thank you. write an equation for the line in slope-intercept form.

Passing through (-8,-3) and (-5,-8)