Vikas can cover a distance of $20\frac{2}{3}$ km in $7\frac{3}{4}$ hours on foot. How many km per hour does he walk?

Distance covered by Vikas in $7\frac{3}{4}$ h = $20\frac{2}{3}$ km
∴ Distance covered by him in 1 h = $\left(20\frac{2}{3}÷7\frac{3}{4}\right)$ km
= $\left(\frac{62}{3}÷\frac{31}{4}\right)$ km
= $\left(\frac{62}{3}\times \frac{4}{31}\right)$ km
= $\left(\frac{2\times 4}{3}\right)$ km =$\left(\frac{8}{3}\right)$ km = $2\frac{2}{3}$ km

Hence, the distance covered by Vikas in 1 h is $2\frac{2}{3}$ km.