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8 kmph

11 kmph

12 kmph

14 kmph

C. 12 kmph

Let the distance travelled by x km.

$Then,\frac{x}{10}-\frac{x}{15}=2$

$\Rightarrow 3x-2x=60$

$\Rightarrow x=60km$.

Time taken to travel 60 km at 10 km/hr = $\left(\frac{60}{10}\right)$ hrs = 6 hrs.

So, Robert started 6 hours before 2 P.M. i.e., at 8 A.M.

Required speed = $\left(\frac{60}{5}\right)$ kmph. = 12 kmph.