Average Speed Questions

A car travels $20\text{km}$ in the first one-fourth part of an hour, $25\text{km}$ in the second one-fourth part, and $15\text{km}$ in the third one-fourth part. What is the average speed of the car (in $\text{km/h}$) during the entire journey?

A train travels a distance of $60\text{km}$ at a speed of $80\text{km/h}$, $100\text{km}$ at a speed of $90\text{km/h}$, and another $140\text{km}$ at a speed of $120\text{km/h}$. Find the average speed for the entire journey. (Round off to the nearest integer.)