Question

The height of a multistorey building is 190 m and the depth of its basement is 10m. A lift in building moves at a rate of 10 m/15 second. If a man starts from terrace, how long will it take him to reach at bottom of the basement ? Ch 1 Maths class 7 ​

Answer 1

Step-by-step explanation:

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.