A boat takes 45 minutes to cover 2 km in the opposite direction of the stream and 3 km in the same direction, while the boat covers 3 km upstream and 9 km downstream in 90 minutes. Find the speed of the boat against the drift.
1
8 km/hr
2
2 km/hr
3
6 km/hr
4
4 km/hr
5
12 km/hr