Two donkeys are standing 400 meters apart. First donkey can run at a speed of 3 m/sec and the second can run at 2 m/sec. If two donkeys run towards each other after how much time (in sec) will they bump into each other?
A) 60 B) 80 C) 400 D) 40
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Name a polygon which has three lines of symmetry, no point of symmetry and rotational symmetry of order three. Which of the following regular polygons have both point symmetry and rotational symmetry? Justify your answer.
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the answer is B).
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