exam Maths Puzzle Numerical Ability

a stone is dropped from a cliff. In the 4 sec, the sound of the stone striking the ground reaches the top of the cliff. If we assume that the speed of sound is 1100 ft/sec, how high is the cliff?

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I tried this problem and did not understand my answer. i would put in my work but some of the terms i need like a fraction line are not on my computer

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