exam Maths Puzzle Numerical Ability

Simplify the rational expression

21-7x/18-6x

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exam Other Question

mary is running to school. She leaves home at 8am trotting at a speed of 7mph. Her little lamb leaves home at at 8:15am running at a speed of 12 mph. What time of day will the lamb catch mary? Round your answer to the nearest minute. (Example 1027 am) Write a matrix equation for the system of equations:
5a+3b=6
2a-b=9

so I'm still working on it but is[x]= -1/11[-1-3]
[y] [-2 5] righ