A person leaves their house at 8:00 am, walks 6 km at $4 km / h$, and then cycles another 12 km at $12 km / h$ to reach their workplace. What time does the person reach their workplace?
Two friends, Amit and Sunil, start at the same point and walk in opposite directions. Amit walks at $4 km / h$, and Sunil walks at $5 km / h$. After 3 hours, how far apart will they be?
A plane flies from City A to City B, covering a distance of $1,200 km$ in 2 hours. The return trip takes 2 hours and 30 minutes due to strong headwinds. What is the average speed of the plane for the entire journey? $\left[\right.$ Average speed $\left.=\frac{\text { total distance covered }}{\text { total time taken }}\right]$