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Q.

The wheels of a car are 80 cm each. How many complete revolutions does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour?


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a

4375

b

4376

c

4377

d

4378 

answer is A.

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Detailed Solution

Concept- We will first determine the circumference of the wheels in metres, followed by the speed of the car in metres per minute. Then we simply divide the distance travelled by car in 10 minutes by the circumference of the wheel to get the number of revolutions.
Diameter of wheel Question ImageRadius Question Image1 complete revolution of wheel Question Image Circumference of wheel Question ImageQuestion ImageQuestion ImageSpeed of the car Question Image.
Question Image Speed of the car Question Image.
In 10min, the car will travel a distance of Question ImageNo. of revolutions of wheel Question ImageTherefore, each wheel of the car makes 4375 complete revolutions in Question Image.
Hence, the correct answer is option 1) 4375.
 
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