Question

the diameter of the wheel of a car is 77cm .how many revolution will it make to travel 121 km?

Answer 1

At first , you have to find the circumference of wheel i.e. the distance covered in one Revolution
i.e 2*22/7*77/2 = 242 cm
Now, no. of Revolutions = 121*1000*100/242
i.e. 50,000.