An athlete completes one round of a circular track of radius R in 40 sec. What will be his displacement at the end of 2 min 20 seconds?

Question

$$\begin {array} {1 1} (1)\;7R & \quad (2)\;2R \\ (3)\;2 \pi R & \quad (4)\;7 \pi R \end {array}$$

Comments

Plz give me the solution of this question.