Discussion

One train is traveling 45 kmph and other is at 10 meters a second. Ratio of the speed of the two trains is?

Answer: A

\[ 1 \text{ kmph} = \frac{5}{18} \text{ m/s} \]

Put both speeds in the same units.

\[ 45 \text{ kmph} = 45 \times \frac{5}{18} = 12.5 \text{ m/s} \]

\[ 12.5 : 10 = 5 : 4 \]

Comparing 45 with 10 directly would give the meaningless 9 : 2 - the third option.

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