Question

The minute hand of a watch is $1.5cm$ long. How far does it move in $40$ minutes? (use $\pi =\frac{22}{7}$)

Answer 1

A minute hand move a complete circle in $60min$

now, Distance covered in 60 minutes = $2\pi \left(1.5\right)=3\pi cm$

so, distance covered in 1 minute,= $=\frac{3\pi }{60}cm$

Hence, distance covered in 40 minutes $=\frac{3\pi }{60}\times 40=2\pi =\frac{44}{7}cm$