Sunayana is cycling in such a way that the wheels of the cycle are making 210 revolutions in a minute. If the diameter of the wheel is 80cm, calculate her speed in km/hr.
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Answer:
31.68 km/hr
Step-by-step explanation:
Number of revolution in 1 minute = 210 revolutions
Diameter of the wheel = 80 cm
Than radius = 80/2 = 40 cm
Circumference of circle = 2πr
=2×22/7×40
=251.428571 4285714 cm
Distance covered in 210 revolutions = 251.428571 4285714 × 210 = 52800
Distance covered in km = 52800/100000 = 0.528 km
Distance covered in one hour = 0.528 × 60 = 31.68 km/hr (answer)
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