Q:
The wheel of a motorcycle 70cm in diameter makes 40 revolutions in every 10sec.What is the speed of motorcycle n km/hr?
Answer & Explanation
Answer: B) 31.68kmph
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*227*35=8800cm = 88 m
Distance covered in 1 sec = 8810=8.8m/s=8.8*185km/hr=31.68km/hr
View Answer
Report Error
Discuss