15-06-2017
Mathematics

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a lift can carry passengers to 10 storeys in 9 seconds

a lift can carry passengers to 10 storeys in 9 seconds class=

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15-06-2017

Time taken by lift to reach 10 storeys = 9 seconds.
Time taken by lift to reach 1 storey = 10 / 9 = 1.1 seconds
Time taken by lift to reach 15 storeys = 1.1 * 15 = 16.5 seconds

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