| Find the number of revolutions, a wheel of diameter 40 cm can make in travelling a distance of 176 m. \[\left( \operatorname{take}\pi =\frac{22}{7} \right)\] |
A) 140
B) 160
C) 168
D) 166
Correct Answer: A
Solution :
| Distance covered in 1 revolution |
| = Circumference of wheel |
| \[=2\pi r=2\times \frac{22}{7}\times 20\,cm\] |
| Total distance = 176 m = 17600 cm |
| \[\therefore \] Number of revolutions \[=\,\,\frac{17600}{2\times \frac{22}{7}\times 20}\] |
| \[=\,\,\frac{17600\times 7}{2\times 22\times 20}=140\] |
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