book Maths Puzzle Numerical Ability

A boat can travel on a river 7 miles upstream in the same time it takes to travel 9 miles downstream. Find the speed of the current if the speed of the boat in still water is 8 miles per hour.

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The park service is studying a rectangular piece of land that has an area of 91 square miles. The length of this piece of land is 1 mile shorter than doubel the width. Find the len please help! a grocery store is selling hamburger for $1.89 per pound. this is $.28 less than the price at a competitor's store. find the price at the competitor's store. thank-y