book Maths Puzzle Numerical Ability

jim can run 5 miles per hour on level ground on a still day. One windy day, he runs 10 miles with the wind, and in the same amount of time runs 5 miles against the wind. what is the rate of the wind?

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book Other Question
whats the square root of 3 + the square root of 1 over 3 If N(t)=N(0)a^pi^t

How would you determine:
1) N(0)
2) pi

Thanks