Correct Answer: Option C
Let the staircase have n steps
Now, Mr Shah covers n - 26 steps in 30 seconds and n - 34 steps in 18 seconds. Assuming that Mr Shah's speed in either case is same, we have (n - 26)/30 = (n - 34)/18 18n - 18*26 = 30n - 30*34 12n = 30*34 - 18*26 n = 552/12 n = 46 steps
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