book Maths Puzzle Numerical Ability

In a right triangle, one of the acute angles is 2 times as large as
the other acute angle. Find the measure of the two acute angles.

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Please help me solve this equation: 62=z-15 Mr X spent 2.5 hrs biking up a mountain. Rested for 30 minutes. Biked down in 1.5 hrs. How far did Mr. X bike, if his rate of ascent was 3 km/hr less than his rate of decent?