1. The problem statement, all variables and given/known data Sam has three dogs sitting at the vertices of an equilateral triangle. The length of each side of the triangle equals to s meters. Sam gives the command "Start!" and each dog starts to run with constant speed v meters per second. At each moment, each dog is running towards the dog just right to him (in counter-clockwise direction). Therefore, their trajectories are forming some spirals that converging to one point as shown in the attachment. How long does it takes dogs to meet each other after the command "Start!"? 2. Relevant equations Time = Distance / Speed 3. The attempt at a solution For Speed = 5 and Side = 2 Approximate answer is 0.266667. But I don't know how to get that. I'm struggling to find the distance the travelled by the dogs. Once I have got the distance , I can plug it in the above formula to get the time. I know I'm certainly missing something . Any help would be appreciated.