exam Maths Puzzle Numerical Ability

A boat can travel 5 miles upstream and 5 miles downstream in a total of 6 hours. If the speed of the current is 2 miles per hour, what is the speed of the boat in still water?

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IS (SQRT X)^2 AN IDENTITY ( TRUE FOR all NONNEGATIVE VALUES OF X ^2)EXPLAIN A chemist needs 120 milliliters of a 59% solution but has only 32% and 68% solutions available. Find how many milliliters of each that should be mixed to get the disired solution.