SSC Sample Paper Mock Test-8 SSC CGL Tear-II Paper-1

Diameter of a wheel is 3 cm. The wheel revolves 28 times in a minute. To cover 5.280 km distance, the wheel will take \[\left( \text{Take}\,\,\pi =\frac{22}{7} \right)\]

A) 10 min

B) 20 min

C) 30 min

D) 40 min

Correct Answer: B

Solution :

Diameter of the wheel = 3 m

\[\therefore \]Circumference \[=\pi \times \] diameter \[=\frac{22}{7}\times 3=\frac{66}{7}\,\,\text{m}\]

Since, a wheel covers a distance equal to circumference in one revolution, therefore, distance covered in

28 revolutions \[=28\times \frac{66}{7}=264\,\,\text{m}\]

Now, 264 m distance is covered in 1 min

\[\therefore \] 5280 m distance will be covered in \[=\frac{5280}{264}\]

= 20 min