Question

A truck has wheels which are 112cm in diameter, how many complete revolutions does each wheel make in 20 minutes when the truck is travelling at a speed of 66km/hr?​

Answer 1

Answer:

625 revolutions

Step-by-step explanation:

no of revolutions= distance travelled/circumference

                           =  66x20/60|/2x22/7x56x100x100

                           =66x20/60x1/2x7/22x100x100/56

                           =12.5x50

                           =625

Answer 2

Answer:

Step-by-step explanation:

distance covered in 1 rotation =2πr=2*22*56/7=352 cm=3.52m

66km/hr=1100m/min

no of rotations per min=1100/352

then rotations in 20 min =20*110000/352

=6250

thus no of rotations =6250