book Maths Puzzle Numerical Ability

An Earthquake measure 6.3 on the richter scale. Find the magintude of this earthquake.

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book Other Question

A commonly asked question is, "How long will it take to double my money?" At 10% interest rate and continous compounding, what is the answer?
The base amount should be $10,000 and the compounding rate is 2.7183. A bus traveled for 2h @ r mi/h, then decreased the speed by 10 mi/h and traveled for 1 more hour. How far did the bus go?