Respuesta :

Answer:

50,020 revs to nearest rev.

Step-by-step explanation:

r = 1/2 * diameter

Circumference of the wheel = 2 pi r

= 2 * pi * 1/2 * 77

= 77pi cms

1 km = 1000 * 100 cms so

The number of revolutions =  (121 * 100 * 1000) / 77pi

= 50,020 revs to nearest rev.