The wheel of an engine of 300 cm in circumference makes...

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The wheel of an engine of 300 cm in circumference makes 10 revolutions in 6 seconds. What is the speed of the wheel (in km/h)?

A. 18

B. 20

C. 27

D. 36

Answer: Option A

Solution(By Examveda Team)

Circumference = One revolution
Distance covered in 10 revolutions = 300 * 10 = 3000 cm = 30 m
30 meters are covered in 6 seconds.
Speed of the wheel = $$\frac{{30}}{{\text{6}}}$$ = 5 m/s
5 m/s = $$\frac{{5 \times 18}}{5}$$ = 18 km/h. [ To convert m/s to km/h, we use to multiply by factor $$\frac{{18}}{5}$$ ]

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