Question

plz tell with proper expalation​

Answer 1

Answer :-

Each floor has the height of 5m and basement of 3 floors.

If a man starts from 50m above ground and reached at 2nd  floor of basement.  

Distance traveled above basement =50 m

And below basement =2×5=10 m

Total distance traveled=(50+10)m=60m

Rate of moving of a lift =1m/s  

that is in 1 second it moves 1 metre.

So, time taken to reach 60 metre =60×1=60 s

Hence, a man reaches at 2nd  floor of basement in 60 seconds.

Hope it might helps.