The diameter of a cycle wheel is 14 cm. A cyclist takes 30 minutes to reach a destination at a speed of 11 km/hr. How many revolutions will the wheel make during the journey?

Distance covered by cyclist in 30 minutes

$=left(11 imes frac{5}{18} imes 30 imes 60 ight)$ metre $=5500$ metre

Circumference of wheel = S × diameter

$=frac{22}{7} imes 14=44 mathrm{~cm} .$

$herefore$ Number of revolutions $=frac{(5500 imes 100) mathrm{cm} .}{44 mathrm{~cm} .}$

$=12500$