Question

diameter of wheel is 21cm, how many revolutions will it make to travel 1.98 km

Answer 1

diameter = 21cm
radius = 10.5
curved surface area of cylinder = 2pie rh
1.98 = 2×22/7×105/100×h
1.98 = 2×22×15×h/100
1.98 = 44×15×h/100
1.98 = 660×h/100
1.98×100/660 = h
198/600 = h
0.3 = h