For every 1/5 hour a clock loses 2 minutes. how many minutes will the clock lose after 4 hours.​

40

Step-by-step explanation:

The clock loses 2 minutes every 1/5 hour. A whole hour, or 5/5 would be 10 minutes lost. For four hours, multiply that by 4, so 10x4=20.

< 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⭐