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(1) In this problem, the word "matches" has the same meaning as the word "games".
Thus 10 games is two times 5 games, and the rate remains the same.
Hence, WHAT ?
I do not write the answer, since it is OBVIOUS and lies on the surface.
You should get it on your own. It is as simple as to get that 2 x 2 is 4.
(2) 4 hours is four times 1 hour, and the rate remains the same.
Hence, WHAT ?
I do not write the answer, since it is OBVIOUS and lies on the surface.
You should get it on your own. It is as simple as to get that 2 x 4 is 8.
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Having these explanations, boldly go forward and get the answers on your own.
The method which you should apply is called "common sense".
So, develop your common sense.