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The wheel of a car are of diameter 80 cm each.how many complete revolution does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hours

    • Posted by Priyanka Rani 5 years, 8 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    ꧁༒☬Sowndu☬༒꧂???꧁༒????༒꧂ ??? 5 years, 8 months ago

    Yes u are write

    0Thank You

    Gaurav Seth 5 years, 8 months ago

    Radius of wheel= 80/2 = 40cm
    ∴ The distance travelled in one revolution is = 2πr = 2 x 22/7 x 40 = 1760/7 cm.
     
    speed of car= 66km/hr= 66 x 1,00,000/60 cm/min = 1,10,000 cm/min.
    distance covered by car in 1 min = 1,10,000cm
    distance covered by car in 10min =  110,000 x 10 = 11,00,000cm.

    number of complete revolution =
                   distance covered in 10min / distance covered in one revolution.
    = 11,00,000/ 1760/7 
                          = 11,00,000/1 x 7/1760 = 4375 revolutions.

    Hence, in 10min each wheel of car makes 4375 revolutions.

    0Thank You

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