Question on: WAEC Mathematics - 2010
If x km/h = y m/s, then y =
A
\(\frac{7}{18}\)x
B
\(\frac{11}{20}\)x
C
\(\frac{4}{15}\)x
D
\(\frac{5}{18}\)x
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Correct Option: D
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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