exam Maths Puzzle Numerical Ability

Can someone please help! I had these multiple choice questions for homework and get them wrong.

8 over square root 7 - square root of 2

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exam Other Question

Martina leaves home at 9am, bicycling at a rate of 24mi/h. Two hours later, John leaves driving at the rate of 48mi/h. At what time will John catch up with Martina? can you please help me indicate if the following set of lines is parallel, perpendicular, or neither. (((y= 2x-5 y= 2x+5)))