Question

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

Answer 1

Answer:

25

Sum of 6 numbers =60×30=180

Sum of first 4 numbers =4×25=100

Sum of last 3 numbers =3×35=105

∴ Fourth number =(100+105)−180

=205−180

=25

Answer 2

Step-by-step explanation:

$hope \: it \: helps$