Question

Every floor of a 20 storey building is 5 meter high. If a lift moves 3 meter every second. How long will it take to move from 3rd floor to 12th floor?

Answer 1

Answer:

So, it takes 15 seconds to move from the 3rd to the 9th floor.

Step-by-step explanation:

Every floor of a 20 storey building is 5 meters high.

So, if the lift moves 3 meters every second.

Then,

From 3rd floor to 12th floor there are 9 floors

One floor is 5 meters high

Then 9 floors will be 45 meters high.

So, if the lift moves 3 meters every second

Then, from 3rd to 9th floor it is 45 meters

So, 45/3=15 seconds

So, it takes 15 seconds to move from the 3rd to the 9th floor.

Answer 2

Answer:

      time taken = 20s

Step-by-step explanation:

Height of each store = 5m

Height till 12th floor = 12 × 5

                                 = 60m

Rate of climb of elevator = 3m/s

time taken = distance / Rate of climb

                  = 60m / 3m/s

                  = 20s

∴time taken = 20s

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