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1.
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. 5 : 30 pm
- B. 5 : 30 pm
- C. 5 : 30 pm
- D. 5 : 30 pm
Answer: Option C
Explanation:
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
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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