Discussion

Explanation:

Speed of Akas while going upstairs = 3 + 2 = 5 s/s.

Time take to go up = 60/5 = 12 seconds.

Speed of Akas while going downstairs = 3 - 2 = 1 s/s.

Time take to come down = 60/1 = 60 seconds.

⇒ Total time taken by Akash = 12 + 60 = 72 seconds.

Hence, 72.

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