exam Maths Puzzle Numerical Ability

If a river flows at a rate of 3mph and a boat travels 60 miles upstream and returns in a total time of 9 hours. How fast would the boat travel be traveling in still water?

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f(x)= 7x + 5 / 2 - 3x find vertical and horizontal asymptots and given equation. I think the Ha. is 7/3?????????? In 1990, the St. Louis metropolitan area had an average of 82 x 10^-6 g/m^3 of pollutants in the air. How mant grams of polltants were there in 2 x 10^3 m^3 of air?