Every floor of a 20 storey building is 5m high.if a lift moves 2 metres every second,how long will it take to move from 3rd floor to 15th floor?
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https://www.meritnation.com/ask-answer/question/every-floor-of-a-104-storey-skyscraper-is-4-m-high-if-a-bal/integers/7393033
Regards