A bicycle wheel of radius 42cm is rolled over a distance 66 meters. How many revolutions does it make?[Take (pi = frac{22}{7})]
-
A.
2.5 -
B.
5 -
C.
25 -
D.
50
Correct Answer: Option C
Explanation
circumference of the bicycle wheel
(= 2pi r = 2 times frac{22}{7} times 42 – 264cm = 2.64m\)
Number of revolution
(=frac{66}{2.64} = 25)