SSC Government Jobs Exams Numerical Ability Area and Volume

A square is of area 200 sq. m. A new square is formed in such a way that the length of its diagonal is ?2 times of the diagonal of the given square. The the area of the new square formed is

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If a regular polygon has each of its angles equal to 3/5 times of two right angles, then the number of side is A motor-boat can travel at 10 km/hr in still water. It travelled 91 km downstream in a river and then returned to the same place, taking altogether 2 hours. Find the rate of flow of river-