Question

find it speed in km per hour ​

Answer 1

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Answer 2

Distance covered in 1 revolution = π × d

$= ( \frac{22}{7} \times 84) \: cm \\ \\ = 22 \times 12 \\ 264 \: cm$

Distance covered in 1 second = 5 × 264

= 1320 cm

So, Distance in Kilometres = 1320 / 100000

= 0.0132 km

Now, Time in Hours = 1/ 60 × 60

= 1/ 3600 h

$s \: = \frac{d}{t} \\ \\ s \: = \frac{0.0132}{ \frac{1}{3600} } \\ \\ = \frac{0.0312 \times 3600}{1} \\ \\ = 0.0132 \times 3600 \\ = 47.52$

Speed = 47.52 km/ h

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