The hour-hand of a clock is 6 cm long. The angle swept by it between 7:20 a.m. and 7:55 a.m. is :\

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(b) : Time duration from 7:20 a.m. to 7:55 a.m.\ $=55-20=35$ minutes\ $=\frac{35}{60}$ hour\ Now, angle made in 12 hours $=360^{\circ}$\ ⇒ Angle made in 1 hour $=\frac{360^{\circ}}{12}=30^{\circ}$\ So, angle swept in $\frac{35}{60}$ hours $=\frac{35}{60} 	imes 30^{\circ}=\left(\frac{35}{2}ight)^{\circ}$\