exam Maths Puzzle Numerical Ability

Rowing with the current, a canoeist paddled 14 miles in 2 hours. Against the same current he could only paddle 10 miles in the same amount of time. What is the rate of the current in mph?

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The amount of ozone in the atmosphere is decreasing by 0.25% annually. If this rate of decrease continues, after how many years will 82.9% of today's ozone remain? an escalator lifts people to the secomd floor, 25ft above the first floor. the escalator rises at a 30 degree angle. how far does a person travel from the bottom to the top of the escalator?