Elina and Gustavo leave Cayley H.S. at 3:00 p.m. Elina runs north at a constant speed
of 12 km/h. Gustavo walks east at a constant speed of 5 km/h. After 12 minutes,
Elina and Gustavo change direction and travel directly towards each other, still at
12 km/h and 5 km/h, respectively. The time that they will meet again is closest to
