book Maths Puzzle Numerical Ability

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5. Suppose you travel north for 65 kilometers then travel east 75 kilometers. How far are you from your starting point?
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simplify:

6 over 2x-12 minus 20 over x^2-4x-12

Please explain in detail so I understand Thanks. In a walkathon to raise money, Elisa walked a certain distance at 5 mph and then jogged twice that distance at 8mph. Her total time walking and jogging was 2 hours and 15 minutes.