Question

A wheel has a diameter of 84 cm. Find how many completer revolutions must it make to cover 3.168 km.

Answer 1

The diameter of the wheel = 84 cm
Thus, the radius of the wheel = 42 cm

Circumference of the wheel = 2 x `22/7` x 42 = 264 cm
In 264 cm, the wheel is covering one revolution.

Thus, in 3.168 km = 3.168 x 100000 cm, number of revolutions
covered by the wheel = `3.168/264 xx 100000` = 1200.