A drunkard is walking along a straight road. He takes 5 steps forward and 3 steps backward and so on. Each step is 1 m long and takes 1 s. There is a pit on the road 11 m away from the starting point. The drunkard will fall into the pit after
A21 s
B29 s
C31 s
D37 s.
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https://www.meritnation.com/ask-answer/question/drunkard-walking-in-a-narrow-lane-takes-5-steps-forward/motion-in-a-straight-line/6327848