Question 3
A river flows from $A$ toward $B$. Two motorboats leave $A$ simultaneously, travel to $B$, and immediately return to $A$. On the outward trip, boat 1 has speed $2v$ km/h and boat 2 has speed $v$ km/h; when boat 1 reaches $B$, boat 2 has covered $\frac59 AB$. On the return trip, boat 1 has speed $v$ km/h and boat 2 has speed $2v$ km/h. Their finishing times differ by $3.2$ minutes. How many minutes does each boat take for the round trip?