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

This question belongs to Arithmetic Ability Speed Time And Distance
Speed Time and Distance
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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)?

Answer & Solution
Correct Answer: Option A
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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