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A man starts climbing a 11 m high wall at 5 pm. In each minute he climbs up 1m but slips down 50 cm. At what time will he climb the wall?

A man starts climbing a 11 m high wall at 5 pm. In each minute he climbs up 1m but slips down 50 cm. At what time will he climb the wall? Correct Answer 5 : 21 pm

Man climbs 1m and slips down 50 cm (0.5m) in one minute i.e. he climbs (1 - 0.5 = 0.5 m) in one minute. But in the last minute, he will be climbing 1m as he gets on the top so no slip. Time taken to climb 11 meter = (10/0.5) + 1 = 21 minutes. He climbs the wall at 5:21 pm

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