Question

How many revolutions will the wheel of a bicycle make to cover 4.4 km . if its diameter is 70 cm

Answer 1

Radius=70/2=35cm
Circumference=2πr=2×22/7×35=220cm
220cm=2.2m
4.4km=4400m
No. of rotations=4400/2.2=2000

Answer 2

FOR THAT , first find the perimeter of the wheel and then divide it with the distace it covered to get the answer 

so, therefore,
2(pi)r=2*(22/7)*35
        =2*22*5
        =44*5
        =220 cm square

=440000/220
=2000 revolutions