how many revolutions does the tyre make if the car travels 10 km – Discussion Forum

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Sonal Chauhan

Asked: September 16, 2026In: Class 9 Maths

If the diameter of a car tyre is 56 cm, then: (i) How far does the car need to travel for the tyre to complete one revolution? (ii) How many revolutions does the tyre make if the car travels 10 km?

(i) One revolution covers circumference π x d = (22/7) x 56 = 176 cm (1.76 m). (ii) In 10 km (1,000,000 cm), number of revolutions is 1000000 / 176 = 5681.82, or approximately 5682 revolutions.