exam Maths Puzzle Numerical Ability

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?

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exam Other Question

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? A plan flies 300 miles with a tail wind in 1 hour. It takes the same plan 2 hours to fly the 300 miles when flying against the wind. What is the plane's speed in still air?