Question

if a car covered 121 kilometre if the diameter of a wheel is 77 cm find the number of revolution the wheel takes to cover​

Answer 1

lets take 121 km as 12100000 cm

we need to find circumference of wheel as the diameter is 77

circumference= πd              {where d=diameter}

π=22/7

circumference of wheel =22/7×77

                                        =242 cm

no of revolution =12100000/242

                           =50000 revolutions

∴The number of revolution the car took was 50000