Answer:
The effective
distance travelled by drunkard in 8 steps = 5 - 3 = 2 m. Therefore, he takes 40
steps to move 10 metres. Now he will have to cover 5 metres more to reach the
pit, for which he has to take only 5 forward steps. Therefore, he will have to
take = 40 + 5 = 45 steps to move 15 metres. Thus he will fall into the pit
after taking 45 steps, i.e., after 45 seconds from the start.
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