exam Maths Puzzle Numerical Ability

A boat can go 10 miles against the current in the same it can go in 30 miles with the current. The current flows at 4 mph. Find the speed of the boat in no current.

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exam Other Question
determine the point A(x,y) so that the points A(x,y), B(0,3), C(1,0), D(7,2) will be the vertices of a parallelogram? use synthetic division to solvE:
(-x^3+75x-250) / (x+10)