exam Maths Puzzle Numerical Ability

If two inlet pipes are both open, they can fill a pool in 1 hour and 12 minutes. One of the pipes can fill the pool itself in 2 hours. How long will it take the other pipe to fill the pool itself?

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please help me:

the sum of the digits of a two-digit number is 12. if the digits are reversed, the new number is 15 more than twice the original number. what is the original number? My question is from a worksheet. It is as follows:Tony is 50 years older than Brett. Twenty years ago Tony was at three times as old as Brett was. At most, now old is Brett now?
I am really lost on this question.