book Maths Puzzle Numerical Ability

John left Memphis at noon driving due north at 55 mph. One hour later, Mike left Memphis driving due south at 65 mph. At what time are John and MIke 367 miles apart?

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book Other Question

The sum of two numbers is 1457. Four times the first number minus twice the second number is 8. Find the larger number.

I had to turn my book in so I no longer can find the answer. I am in 8th grade Pre-Algebra how do i compute the square root of a real number,so that i can use the formula in a programming language?