sahil runs in a triathlon consisting of three phases in the following manner. Running 12km ,cycling 24km, and swimming 5km. His speeds in the three phases are in the ratio 2:6:1. He completes the race in n minutes. Later, he changes his strategy so that the distance he covers in each phase are constant but his speed are now in ratio 3:8:1.The end result is that he completes the race taking 20 minutes more than the earlier speed. It is also known that he has not changed his running speed when he changes his strategy. What is his initial speed while swimming?