exam Maths Puzzle Numerical Ability

At 10:30A.M. two planes leave Houston one flying east at 560km/h and the other flying west at 640 km/h at what time will they be 2100 km apart

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I am not sure I have worked this problem correctly could you please help?

Solve the system by addition...

-2x + 3y = -15
x - 2y = 11

Thank you for your help. Use the intercepts to graph the equation x+2y=4.