法拉和杰米尔同时从各自的家出发前往公园。法拉以 30 km/h 的平均速度行驶了 20 km 到达公园。杰米尔以 42 km/h 的平均速度从家出发，比法拉晚 15 分钟到达公园。杰米尔家到公园的距离是多少？ 答：___

1. Calculate the time taken by Farah to reach the park

Time taken by Farah $= \frac{\text{Distance}}{\text{Speed}} = \frac{20}{30} = \frac{2}{3}$ hours.
$\frac{2}{3}$ hours $= \frac{2}{3} \times 60 = 40$ minutes.

2. Calculate the time taken by Jamil

Since Jamil left at the same time but arrived 15 minutes later, his travel time is:
$40 + 15 = 55$ minutes.
Convert this back to hours: $\frac{55}{60} = \frac{11}{12}$ hours.

3. Calculate the distance Jamil travelled

Distance $= \text{Speed} \times \text{Time} = 42 \times \frac{11}{12} = \frac{42 \times 11}{12} = 38.5$ km.