The rafts swam simultaneously in opposite directions. when one raft sailed 44 km / h at a speed of 4 km / h

The rafts swam simultaneously in opposite directions. when one raft sailed 44 km / h at a speed of 4 km / h, the distance between the rafts became 66 km. At what speed was the other raft sailing?

Let’s find how long the rafts sailed in opposite directions:
t = S1 / v1;
t = 44/4 = 11 hours.
Let’s find the distance that the second raft sailed:
S2 = S – S1;
S2 = 66 – 44 = 22 km.
Let’s find the speed of movement of the second raft:
v2 = S2 / t;
v2 = 22/11 = 2 km / h.
Check:
(v1 + v2) * t = (4 + 2) * 11 = 66 km.
Answer: the second raft was moving at a speed of 2 km / h.