Question

which of following smaller 20 m per second 72 km per hour​

Answer 1

On converting m/s into km/h

$20 \times \frac{ \frac{1}{1000} }{ \frac{1}{3600} } \\ \\ = > 20 \times \frac{3600}{1000 } \\ \\ = > 20 \times \frac{18}{5} = 72$

So, 20m/s = 72km/h

Thus, Both are equal ✔️✔️

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