Every floor of 30 storey building is 4 m high. A left moves 2 metres per second. How long will it take to move from 5th floor to 28th floor.
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18
Answer:
Time taken by lift to move 4 m= 2second
Floor had to be covered by lift = 10
time taken = speed × distance
=2 × 10 seconds
=20 second s
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