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14 km

15 km

16 km

17 km

C. 16 km

Let the distance travelled on foot be x km.

Then, distance travelled on bicycle = (61 -x) km.

$So,\frac{x}{4}+\frac{(61-x)}{9}=9$

$\Rightarrow 9x+4(61-x)=9x36$

$\Rightarrow 5x=80$

$\Rightarrow x=16km.$