Question

A wheel having radius 50cm rotates 280 times in 1 minute. Find out the speed of the wheel in km/hr.​

Answer 1

Answer:

52.75 Km/hr

Step-by-step explanation:

r = 50 cm. π =3.14

circumference = 2πr =2×3.14×50

=314cm

1 rotation =314cm

280 rotations =280×314 = 87,920cm in 1 minute

1 hr = 87,920×60 =52,75,200 cm/hr

1km =1000metre

1 metre =100cm

1 km =100000cm

52,75,200÷100000

=52.75 km/hr

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