I see an object 3 kms to east and 4 kms to north. It appears to be moving at 1 km per minute in south west direction. At what speed (km per minute) is it getting closer to me?

A

$$\frac{1}{5\sqrt{2}}$$

B

$$\frac{1}{5}$$

C

$$\frac{7}{5\sqrt{2}}$$

D

$$\frac{7}{5}$$