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A drunkard is waking along a straight road. He takes 5 steps forward and 3 steps backward and so on. each step is 1 m long and takes 1s. There is a pit on the road 11 m away from the starting point. The drunkard will fall into the pit after

If a particle travels n equal distance with speeds v1, v2,......... vn, then the average speed fo the particle will be