exam Maths Puzzle Numerical Ability

At 10:00 a.m, a car leaves a house at a rate of 60 mi/h. At the same time, another car leaves the same house at a rate of 50 mi/h in the opposite direction. At what time will the cars be 330 miles apart?

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Can someone please help me out with this: I am supposed to find the length x. Express your answer in simplified radical form. the triangle is 51 ft on one side, 45 ft on the other side, then there is x. A Star emits radiation at 424nm; it would normally emit radiation at 430nm. What is its radial velocity and direction.