A driver has to cover a distance of 15km in order to complete his trip for the day. By he has time constraint of 2 hrs. At what speed should he drive in order to complete his trip within the available time?

Question

$\begin{array}{1 1} (a)\; \text{30 km/hr} \\ (b)\; \text{7.5 m/s} \\ (c)\; \text{7.5 km/hr} \\ (d)\; \text{30 m/s} \end{array}$