Correct Answer: Option D

Explanation

x kmh^-1 = y ms^-1

\(\frac{x km}{1 hr}\) = y ms^-1

\(x \times \frac{1km}{1hr}\) = y ms^-1

\(x \times \frac{1000m}{60 \times 60s}\) = y ms^-1

\(x \times \frac{1000}{3600} \frac{m}{s}\) = y ms^-1

\(x \times \frac{5}{18} ms^{-1}\)

\(x \times \frac{5}{18} ms^{-1}\) = y ms^-1

y = \(\frac{5}{18}\)x

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