Question:
The diameter of a wheel is 56 cm. The wheel makes 20 revolutions in 20 seconds. The speed of a wheel is ____ Km/h.
The diameter of a wheel is 56 cm. The wheel makes 20 revolutions in 20 seconds. The speed of a wheel is ____ Km/h.
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Apply the two discounts sequentially to find the missing second discount rate.
Updated On: Jul 7, 2026
- 8.06 Km/h
- 6.336 Km/h
- 5.55 Km/h
- 4.567 Km/h
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The Correct Option is B
Solution and Explanation
The circumference of the wheel, which is the distance it covers in one full revolution, is \(\pi \times d = \pi \times 0.56\text{ m} \approx 1.759\text{ m}\).
Over 20 revolutions, the wheel covers \(20 \times 1.759 \approx 35.19\) m, and since this happens in 20 seconds, the speed works out to \(35.19/20 \approx 1.7596\) m/s.
Converting to km/h by multiplying by 3.6 gives \(1.7596 \times 3.6 \approx 6.336\) km/h, matching option 2.
Over 20 revolutions, the wheel covers \(20 \times 1.759 \approx 35.19\) m, and since this happens in 20 seconds, the speed works out to \(35.19/20 \approx 1.7596\) m/s.
Converting to km/h by multiplying by 3.6 gives \(1.7596 \times 3.6 \approx 6.336\) km/h, matching option 2.
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