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From a point P the angle of elevation of the top of a building is 25.3˚. From another point Q which is nearer to the base R of the building, the angle of elevation of the top of the building is 47.8˚. Points P, Q, and R are on the same straight line on horizontal ground. Given that the distance between P and Q is 25 metres, calculate to 2 decimal places the distance between Q and R.