12. A cyclist rides 1 km straight i...
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12. A cyclist rides 1 km straight in 3 minutes, then returns to the starting point along a semi-circular track in the next 8 minutes. His average speed is (a) 0.32 km min-1 (b) 0.25 km min-1 (c) 0.51 km min-1 (d) 0.64 km min-1

JEE/Engineering Exams
Physics
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( frac{2}{110 m} ) ( R=Y_{2} ) ( W=frac{pi}{2}=D i ) tance of trac Total didtance ( =1+frac{pi}{2}=1+1.57 ) ( =2 cdot 57 quad k_{n} ) Totat the ( =3+8 ) : ( =11 ) meen ( =frac{2 cdot 57}{11}=0.2336 ) ( approx 0.25 mathrm{cm} / )
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