Kiran swims in a 90 m long pool. He covers 360 m in two minutes by swimming from one end to the other and back along the same straight path, twice. Find the average velocity of Kiran.

A

4 $$ms^{-1}$$

B

5 $$ms^{-1}$$

C

3 $$ms^{-1}$$

D

0 $$ms^{-1}$$