Please help will give brainliest

B. 75 stories

Step-by-step explanation:

1.5 minutes is equal to 90 seconds.

To get how many times the elevator will rise in 90 seconds, we divide it by how many seconds it takes to rise.

90/6 = 15

It will rise 15 times in 90 seconds. Since it rises 5 stories each time, we multiply 15 by 5.

15 x 5 = 75

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐

by definition, an arc subtended by a central angle of some given measure has the same measure. so .