exam Maths Puzzle Numerical Ability

A man drives 108 km at an average rate. If he had driven 5 km/hr. faster, he would have made the trip in 15 hours less time. How fast did he drive?

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Can someone help me on this problem:

I need to place the following set of numbers in ascending order:

-2, 8, 0, 2, -3, -20, 11

Thank you,
Lyn
Solve and graph:

2-/x/ > - 2, D = (Integers)
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