 
<translate> Tikitin jirgin karkashin kasa guda yana biyan dala uku. A cikin minti daya, jirgin karkashin kasa yana sayar da matsakaicin irin wannan tikiti 5. Menene kudin shiga daga tikiti a cikin minti 6? Bari mu yi tunani da farko. Sarkar tunani: <eng> One ticket to the underground costs $3. In one minute, the metro sells an average of 5 such tickets. What will be the earnings from the tickets in 6 minutes? Let's think first. Chain of thought: 