The wheel of a tractor has a diameter 1.4m. What distance does it cover in 100 complete revolutions? [Take (pi = frac{22}{7})]
-
A.
140m -
B.
220m -
C.
280m -
D.
440m
Correct Answer: Option D
Explanation
radius = (frac{diameter}{2}) = (frac{1.4}{2})
= 0.7m
circumference = 2(pi r = 2 times frac{22}{7} times 0.7m = 4.4m)
distance covered = 4.4m x 100 = 440m