If a man walks 16 km in 5 hours, how long would he take to walk 11.2 km?

Time taken to walk 16 km = 5 hours.

Time taken to walk 1 km = $\Big(\dfrac{5}{16}\Big) \text{ hours} \quad \text{[Less distance, Less time]}$

Time taken to walk 11.2 km = $\Big(\dfrac{5}{16} \times 11.2\Big) \text{ hours} \quad \text{[More distance, More time]}$

= $\Big(\dfrac{5 \times 11.2}{16}\Big)$ hours

= $\dfrac{56}{16}$ hours

= 3.5 hours (or 3 hours 30 minutes).

Time taken to walk 11.2 km = 3 hours 30 minutes