exam Maths Puzzle Numerical Ability

please help me solve this problem: does a plane have edges?

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exam Other Question

multiply and simplify (4xcubed/2y)(10ysquared/36x) Determine the speed of a motorboat in still water and the speed of the river current, if it takes 3 hrs to travel a distance of 45 miles upstream and 2 hrs to travel 50 miles downstream.