Tokyo stocks opened higher Monday as investor sentiment was supported by gains on Wall Street late last week. In the first 15 minutes of trading, the 225-issue Nikkei Stock Average rose 61.88 points, or 0.22 percent, from Friday to 27,961.65. The broader Topix index was up 5.29 points, or 0.27 percent, at 1,972.32. On the top-tier Prime Market, gainers were led by air transportation, nonferrous metal, and electric power and gas issues. At 9 a.m., the dollar fetched 140.25-28 yen compared with 140.34-44 yen in New York and 139.81-84 yen in Tokyo at 5 p.m. Friday. The euro was quoted at $1.0329-…