exam Maths Puzzle Numerical Ability

please help me Im having trouble solving this problem y2=25

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One drain can empty a storage tank in 8.5 hours. When this drain is used along with a second drain, the tank can be emptied in 5 hours. How long (to the nearest 0.1 hour) would it take the second drain, working alone, to empty the tank? In cm., the bases of an isosceles trapezoid measure 15 and 9 and each of the nonparallel sides has length 5 cm. Find the length of an altitude.