The wheel of a motorcycle 70cm in diameter makes 40 revolutions in every 10sec.What is the speed of motorcycle n km/hr? Choose the correct choice from the following answers:
A) 31.65 B) 31.68 C) 31.62 D) 31.61 E) 31.67
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= 
<gadget id="calculator">70 / 2</gadget>
<output>35</output>
35 cm   Distance covered in 40 revolutions will be= 88 m   Distance covered in 1 sec =   Answer: 31.68) 31.68kmph
<result>B</result>
The wheel of a motorcycle 70cm in diameter makes 40 revolutions in every 10sec.What is the speed of motorcycle n km/hr?