exam Maths Puzzle Numerical Ability

How do I find determinant of a 3 by 3 matrix, using a graphing calculator, or the long way, either way is good for me.

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exam Other Question

A bus leaves a station at 1P.M., traveling west at an average rate of 44 mi/h. At 2P.M. on the same day a second bus leaves the same station, traveling east at a rate of 48 mi/h. Approximately at what time will the two buses be 274 miles apart? What amount of each mixture, one 95% alcohol and the other 15% alcohol, must be used to make 10 liters of a mixture which is 45% alcohol? What equations will express this problem?