The 10-second barrier in the 100-meter dash was first broken in the 1968 Olympics, when the winning time was 9.95 seconds. A gym teacher ran the 100-meter dash in 14.7 seconds. How much faster was the 1968 Olympic time than the gym teacher’s time?

The Runner Finished The 100 Meter Dash 4.75 seconds faster than the gym teacher.

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the answer is 45 i just did it on oddesy ware

< 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

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