Timework16
- Option : B
- Explanation : In 1 minute, monkey ascends 10 metres but he takes 1 minute to slip down 2 metres. Thus, atthe end of 2 minutes, net ascending of the monkey is = 10 - 2 = 8 metres. Thus, to have a net ascending of 8 metres, process of ascending and then slipping happens once. So,to cover 64 metres, above process is repeated 64/8 or 8 times. It is clear that in 8 such happenings, the monkey will slip 7 times, because 8th time, he will ascend to the top. Thus, in climbing 7 times and slipping 7 times, he covers (7 x 8) or 56 metres. Time taken to cover 56 metres = (56 x 2)/8 = 14 minutes Remaining distance = 64 - 56 = 8 metres Time taken to ascend 8 metres = 8/10 = 4/5 min Total time taken = 14 minutes + 4/5 min = 14 mins. 48 sec.
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