book Maths Puzzle Numerical Ability

A water balloon is dropped from a cliff. Exactly 3 seconds later the sound of the balloon hitting the ground reaches the top of the cliff. How high is the cliff?

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Susan drove 3.35 hours at a rate of 50 miles per hour. To the nearest tenth, how long would it take her to drive the same distance at a rate of 45 miles per hour? How to solve Variables?