Two ships are approaching a port along straight routes at constant speeds. Initially, the two ships and the port

Two ships are approaching a port along straight routes at constant speeds. Initially, the two ships and the port formed an equilateral triangle with sides of length 24 km. When the slower ship travelled 8 km, the triangle formed by the new positions of the two ships and the port became right-angled. When the faster ship reaches the port, the distance, in km, between the other ship and the port will be

1. 8
2. 12
3. 6
4. 4