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A multistorey building has 25 floors above the ground level each of height 5m. It also has 3 floors in the basement, each of height 5m. A lift in building moves at a rate of 1 m/s. If a man starts from 50m above the ground, how long will it take him to reach at 2nd floor of basement

Solution:

Let us write all the given parameters first to examine the problem and later we will apply properties of integers.

It is given that the height of each floor = 5 m

Height below the basement to be covered = 2 × 5m = 10m

If a man starts from 50 m above ground level and reaches the 2nd floor of the basement.

Then the total distance to be covered by man = (50 + 10) m = 60 m

Rate of moving of a lift = 1 m/s

A man reach at 2nd floor of basement in 1 × 60 = 60 seconds = 1 minute

✦ Try This: Fill in the blank: 17 × __ = -324

Now to fill the given blank we can apply integer rules and the rule of multiplication

☛ Also Check: NCERT Solutions for Class 7 Maths Chapter 1

NCERT Exemplar Class 7 Maths Chapter 1 Exercise Problem 134

A multistorey building has 25 floors above the ground level each of height 5m. It also has 3 floors in the basement each of height 5m. A lift in building moves at a rate of 1 m/s. If a man starts from 50m above the ground, how long will it take him to reach at 2nd floor of basement

Summary:

After applying the integer rules we examined that if a man starts from 50m above the ground,the time required by man is 1 minute to reach at 2nd floor of basement

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