A) 10 min
B) 20 min
C) 30 min
D) 40 min
Correct Answer: B
Solution :
\[\because \] Diameter of wheel \[=3\,m\] \[\therefore \] Circumference \[=\pi \,d\] \[=\frac{22}{7}\times 3=\frac{66}{7}\,cm\] \[\therefore \] Number of revolutions \[=\frac{5280}{66}\times 7=560\] \[\because \] 28 revolutions took in 1 min \[\therefore \] Time taken \[=\frac{560}{28}\] \[=20\,\text{min}\]You need to login to perform this action.
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