book Maths Puzzle Numerical Ability

A cheetah is 300 feet from its prey. It starts to sprint toward its prey at 90 feet per second. At the same time, the prey starts to sprint at 70 feet per second. When will the cheetah catch its prey?

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Driving down a mountain, Tom finds that he has descended 1800 ft in elevation by the time he is 3.25 mi. horizontally away from the top of the mountain. Find the slope of his descent to the nearest hundredth. Hi I have not a clue how to do any of the proportions and I have a test this coming week! We have all of this proportions and tax-n-tip things and I feel as if I am the only one in