 
<translate> Na biyu da aka samu ya jira minti 20/ 2 = 10. Saboda haka jimlar lokacin jira shi ne 20 + 10 = minti 30. Amsar ƙarshe: 30. <eng> The second dose had a wait time of 20 / 2 = 10 minutes. So the total wait time is 20 + 10 = 30 minutes. The final answer: 30. 