Question

A roller has diameter of 1.4 m.find its circumference and the number of revolutions in makes while travelling 61.6 metre

Answer 1

$d = 1.4m \\ c = \pi \: d = \frac{22}{7} \times 1.4 = 4.4m \\ no \: of \: revolutions = \frac{61.6}{4.4} = \frac{154}{11} = 14$