 
<translate> N'ime otu minit, ụgbọ okporo ígwè na-ere tiketi 5, ya mere ha na-enweta 5 * 3 = $15. N'ime nkeji isii, ha ga-enweta 15 * 6 = $90. N'ihi ya, azịza ya bụ 90. <eng> During one minute the metro sells 5 tickets, so they earn 5 * 3 = $15. So in 6 minutes they would earn 15 * 6 = $90.
Therefore, the answer is 90. 