exam Maths Puzzle Numerical Ability

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There is a pool of water. One Pipe empties the pool in 45 minutes. The other pipe empties it in 67.5 minutes. How long would it take to empty the pool if both pipes were used together?

This is from a worksheet my son brought home. please help to solve

2x - y - z = -5

-2x + 2y - z = 5

x + 3y + z = 6