Every floor of a 18-storey building is 5 metres high. If a lift moves 2.5 metres every 1 second, how long will it take to move from the 2nd floor to the 17th floor?
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2.5 m in 1 second
5 meter in 2 second
distance from 2 to 17 floor = 80 m ( 16 × 5 )
in 2.5 m = 1 second
in 80 m = 80 × 2.5
= 200 second
3.3 minute
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