The total length of the two ropes is 210 meters. If the first rope is increased by (2/3), it will be the same length as the second one. How long is the first rope in meters?
两根绳子共长210米，如果第一根增加(2/3)，就与第二根一样长，第一根绳子长多少米？
<result>78.85</result>