A car travels 112 km at 70 km/h, then 60 km at 50 km/h. What is the total time for the journey?

The formula for time is $\text{time} = \frac{\text{distance}}{\text{speed}}$.
For the first part:

$$t_1 = \frac{112 \text{ km}}{70 \text{ km/h}}$$ $$t_1 = 1.6 \text{ hours}$$

For the second part:

$$t_2 = \frac{60 \text{ km}}{50 \text{ km/h}}$$ $$t_2 = 1.2 \text{ hours}$$

$$T_{\text{total}} = t_1 + t_2$$ $$T_{\text{total}} = 1.6 \text{ hours} + 1.2 \text{ hours}$$ $$T_{\text{total}} = 2.8 \text{ hours}$$

The total time taken for the entire journey is $\text{2.8 hours}$.