Question

A bullock cart wheel radius is 1.4 m. How many rimes does the wheel need to ritate in order to travel a distan9 of 11 km?​

Answer 1

Given ;

radius (r) = 1.4m

Thus circumference (c) :

$c \: = 2 \times \pi \times r$

$= 2 \times \frac{22}{7} \times \frac{14}{10}$

$= 2 \times \frac{22}{1} \times \frac{2}{10}$

$= \frac{88}{10} m$

Given;

total distance (D) = 11km

= 11 × 1000 = 11000m

Thus total number of revolutions (R) :

$R = \frac{D}{c} \\ = \frac{11000}{ \frac{88}{10} } \\ = \frac{11000 \times 10}{88} \\ = \frac{11 \times 10000}{88} \\ = \frac{1 \times 10000}{8} \\ = \frac{10000}{8} = 1250 \: revolutions$

Thus the wheel rotates 1250 times to cover 11km of distance.

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