exam Maths Puzzle Numerical Ability

Please help me with this problem.

6m/7+1/2=1/2

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exam Other Question

1)A jogger starts a course at a steady rate of 8 kph.Five minutes later,a second jogger starts the same course at 10 kph.How long will it take the second jogger to catch the first? Divide the following:

x^+2x-15 over 4x^ divided by x^-25 over 2x-10

Thanks for any help you can offer.