Question : A wheel has a diameter of 84 cm, then how far does the wheel go (in metres) in 16 revolutions? (Take $\pi=\frac{22}{7}$)
Option 1: 42.24
Option 2: 21.12
Option 3: 36.28
Option 4: 27.48
Correct Answer: 42.24
Solution :
Given :
Diameter of wheel = 84 cm
Number of revolutions = 16
Now,
Radius of wheel, $r = \frac{84}{2} = 42 $ cm
Circumference of wheel = $2\pi r = 2\times \frac{22}{7} \times 42 = 264$ cm
Distance covered by the wheel in 16 revolutions:
= 16 × 264
= 4224 cm
= 42.24 metres
Hence, the correct answer is 42.24 metres.
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