Question

the diameter of A wheel of a car is 77 centimetres how many Revolution will it make to travel 121 km km

Answer 1

Dear friend,
the diameter =77cm=2r
so the circumference=2*pi*r
                                 =22/7*77
                                 =242cm
total distance to be travelled=121km=121000m=12100000cm
so,
No. of revolutions =total distance travelled/circumference
                             =12100000/242
                             =100000/2=50000
Hence wheel of car will make 50000 revolutions to travel 121 km


Hope this helps you