2. Write each of the following as a ratio in simplest form. (Hint: Convert to the same unit first.) \( \begin{array}{lll}\text { a. } 60 ¢: 6 & \text { b. } 75 ¢: 3.75 & \text { c. } 90 \mathrm{~cm}: 1.5 \mathrm{~m} \\ \text { d. } 0.6 \mathrm{~kg}: 900 \mathrm{~g} & \text { e. } 3.5 \mathrm{~kg}: 500 \mathrm{~g} & \text { f. } 40 \mathrm{~min}: 3 \mathrm{hours} \\ \text { g. } 20 \mathrm{~min}: 2 \text { hours } & \text { h. } 3 \text { hours }: 40 \mathrm{~min} & \text { i. } 50 \mathrm{~cm}: 3 \mathrm{~m}: 70 \mathrm{~cm} \\ \text { j. } 90 \mathrm{~cm}: 400 \mathrm{~mm}: 3 \mathrm{~m} & \text { k. } 3.5 \text { hours }: 2 \text { days } & \text { l. } 0.12 \mathrm{~km}: 400 \mathrm{~m}: 1.5 \mathrm{~km}\end{array} \)