a bicycle wheel makes 5000 revolutions in moving 11km find diameter of the wheel

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Find the number of meters in 11 km, divide by 5000
= 2.2 m, is the circumference of the wheel

:
d =
d = .7 meters or 70 cm is the diameter of the wheel
;
:
Check this by finding how far the you go in 5000 rev
= 10.99 ~ 11 km 

70