book Maths Puzzle Numerical Ability

A man rows 25 km upstream and 50 km downstream in 12 hrs. The next day he rows 30 km upstream and 65 km downstream in 15 hrs. Then the rate of current is

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Use Cramers Rule to solve

2x-3y+z=5
x+y+z=0
4x+2y+4z=4 Help. I do not understand how to do this. My Algebra book says to use a graphing calculator. Solve the circumference formula for r. If Y1 is the circumference, what expression