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1. A cyclist takes 2 hrs less to cover a distance of 200km if he increases his speed by 5km/h. Find his original speed. 2. A year ago, a man's age was 8 times his son's age. Now his age is equal to the square of his son's age. Find their present ages. 3. A motorboat whose speed in still water is 15km/hr goes 30km downstream and returns to the starting point in a total time of 4 hrs and 30 minutes. Find the speed of the stream.