book Maths Puzzle Numerical Ability

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

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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? What is -1/8 X 2 X 4/-7? I cannot find anything that will help me with this type of problem.