Question

the diameter of a wheel of a car is 77 CM. how many revolution will it make to travel 121 km


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Answer 1

121 km or 12100000 cm

Circumference of the wheel = 2πr

=> 2 × 22/7 × 77/2

=> 22 × 11

=> 242 cm

Number of revolutions = 12100000/242

Number of revolutions = 50,000 revolutions.

Answer 2

AnswEr :

$\underline{\bigstar\:\textsf{According to the Question Now :}}$

$:\implies\tt Distance = Circumference \times Revolution\\\\\\:\implies\tt 121 \:km = \pi d \times Revolution\\\\\\:\implies\tt(121 \times 1000 \times 100) \:cm = \dfrac{22}{7} \times 77 \:cm \times Revolution\\\\\\:\implies\tt 12100000 = 22 \times 11 \times Revolution\\\\\\:\implies\tt \dfrac{12100000}{22 \times 11} =Revolution\\\\\\:\implies\tt \dfrac{1100000}{22} = Revolution\\\\\\:\implies \boxed{\tt Revolution = 50000}$

⠀

$\therefore\:\underline{\textsf{Number of Revolution required is \textbf{50000}}}$