International Maths Olympiad Forum By SOF Olympiad Trainer - Page 128
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Shivansh Shrivastava from Allen carrier institute, Kota
Class : Class 7
C option, when you move up a storey there is distance of 5m and to find the time it take to reach fron 3rd to 15th floor is 15 - 3 = 12 12 * 5 = 60 metre 60/2 = 30 seconds so, the answer is C seconds

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