Which pair of speeds represents nearly the same magnitude?

PHYSICS · Single correct · A Level · Physics · Measurements and their errors · Measurements and their errors

Problem

Which pair of speeds represents nearly the same magnitude? (a)

18\,\text{km h}^{-1}

and

6\,\text{m s}^{-1}

(b)

30\,\text{km h}^{-1}

and

10\,\text{m s}^{-1}

(c)

36\,\text{km h}^{-1}

and

10\,\text{m s}^{-1}

(d)

60\,\text{km h}^{-1}

and

15\,\text{m s}^{-1}