Question

A multi – storied building has 10 floors above the ground level each of height 8m. A lift in the Building moves at the rate 4m/s .If a man starts from 2nd floor above the ground how long he will take to reach at 10th floor and return back to the ground.

Answer 1

$\huge\underbrace\bold\red{AnSwer :-}$

• Answer:20 minutesExplanation: Total distance from 3rd floor basement to 25th floor=140

$25th \: floor \: = 140$

Answer 2

Answer:

Distance Between Ground floor and 2nd floor of basem ent is =5*2=10 m.

So,the total distance between 2nd floor of basement and 50 m above the ground =50+10=60 m.

So,time=distance/speed=60 m/1 m/s=60 s

so,the total time is 60 seconds