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Q.

The wheel of a motorcycle 70cm in diameter makes 40 revolutions in every 10sec.What is the speed of motorcycle n km/hr?

View Answer

Correct choice: B

Explanation:

In this type of question, we will first calculate the distance covered in given time. Distance covered will be : Number of revolutions x Circumference So we will be having distance and time, from which we can calculate the speed. Radius of wheel = 70 / 2 = 35 cm Distance covered in 40 revolutions will be 40*circumferene=40*2πr=40*2*22/7*35=8800cm = 88 m Distance covered in 1 sec = 88/10=8.8m/s=8.8*18/5km/hr=31.68km/hr
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