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
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