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SSC CHSL 2021 PYQ — Question 54

SSC CHSL - 16 April 2021 - Shift 1 • Quantitative Aptitude • Q54

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A bicycle wheel has a radius of 42 cm. It makes 40 revolutions in 25 seconds. What is its speed (in km/h, up to one decimal place)?

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Correct answer: D

Explanation

The correct answer is Option 4 i.e. 15.2

Total distance covered by the wheel = Number of revolutions × circumference of circle

According to the given question,

Circumference = 2πr2 \pi r = 264 cm

Now, distance = 40 × 264 = 10560 cm = 105.6 m

So, Speed=105.625Speed = {105.6 \over 25} = 4.224×1854.224 \times { 18 \over 5} = 15.2 km/hr