\begin{tabular}{l} 3. Solve the following. Show all calculations. \\ \begin{tabular}{|l|l|}\hline a. In autumn, 120 leaves fell from a tree over \\ a period of 4 hours. How many leaves fell in \\ one hour at the same rate? \end{tabular} \\ \( \begin{array}{l}\text { b. Peter drove a total of } 1000 \mathrm{~km} \text { and used } 100 \\ \text { litres of petrol. Calculate the rate at which the } \\ \text { petrol was used in kilometres per litre? }\end{array} \) \\ \hline \( \begin{array}{l}\text { c. Zaheeda scored } 9 \text { goals in } 5 \text { netball matches. } \\ \text { At this rate, about how many goals will she } \\ \text { score in } 10 \text { games? }\end{array} \) \\ \( \begin{array}{l}\text { d. When Richard was climbing up the } \\ \text { mountain, he ascended } 120 \text { metres every } \\ \text { hour. How many metres will he ascend in } 4 \\ \text { hours at the same rate? }\end{array} \)\end{tabular}