Bah its always these I get stuck on.

1. A man walks 18km he goes .5km/h faster than planed and reaches destination 30mins early. What was his planned speed.

2. Chess tournament as 45 games everyone plays together once. How many players attend.

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For number one I used these equations but couldnt come out with anything

18=xt

18=(x+0.5)(t-0.5)

And for number two I got 10 people which is right answer but I did with arithmetic and my teacher wants algebra.