Question

the diameter of the wheel of a car race 77cm how many Revolution will it take to make travel 121 km

Answer 1

Hey friend here is your answer

$circumference \: = \pi \times d$
= 22/7 *77

= 242cm

the revolution of wheel = 12100000 /242

= 50000 revolution

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Answer 2

77cm
$77cm \times 12100 = \\ 12100 \\ \times 77 \\84700 \\ 84700 \times \\ 931700$