Question

Q.3 You may have observed that most multistorey buildings have a parking lot at
the basement level. Suppose a multistorey building has 15 floors above the
ground level and 2 floors below the ground level. The height of each floor is
Sm. What is the height of the building above the ground level? What is its
depth below the ground level? Put the signs that you will use to denote the
floors above the ground level and below the ground level.

it's urgent pls​

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 2

nd

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 2

nd

floor of basement in 60 seconds.