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A car has wheels of diameter 70 m. How many revolutions can the wheel complete in 20 minutes if the car is travelling at a speed of 110 m/s?

500

528

550

600

Explanation:

Radius of wheel = 70/2 = 35 cm
Distance travelled in one revolution = 2πr = 2 *22/7 * 35 = 220 cm
Let the number of revolutions made by wheel is x
So total distance travelled = distance travelled inone revolution * number of revolutions
So total distance travelled = 220x cm
20 mins = 20*60 seconds
Speed of car = 220x/(20*60)
So 110 = 220x/(20*60)
Solve, x = 600

By: MIRZA SADDAM HUSSAIN

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