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A multi storey building has 35 floors ab...

A multi storey building has 35 floors above the ground level each of height 7.5 m. It also has 3 floors in the basement each of height 5 m. A lift in building moves at a rate of 1 m/s. If a man starts from 50 m above the ground, how long will it take him to reach at 3rd floor of basement? A. 40 sec B. 65 sec C. 68 sec D. 32 sec

Text Solution

Verified by Experts

Distance that the lift has to reach from ground floor to basement ` = 3*5 = 15m`
As the man in the lift starts from 50 meter above the ground,
Total distance needs to be covered by the lift ` = 50+15 = 65m`
Speed of lift ` = 1m/sec`
`:. ` Time taken by the lift to reach the ground floor `= 65/1 = 65` seconds.
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