The width of the river is d = 300 m, the velocity of the river is V1 = 1 m / s, the velocity of the ship in still water is V2 = 3 M / s, and the course of the ship forms a 30 degree angle with the upstream bank The width of the river is d = 300m, the velocity of the river is V1 = 1m / s, the velocity of the ship in still water is V2 = 3m / s, and the course of the ship forms a 30 degree angle with the upstream bank (2) Right across the bank (3) How can the course reach the opposite shore (4) What is the shortest way to cross the river

The width of the river is d = 300 m, the velocity of the river is V1 = 1 m / s, the velocity of the ship in still water is V2 = 3 M / s, and the course of the ship forms a 30 degree angle with the upstream bank The width of the river is d = 300m, the velocity of the river is V1 = 1m / s, the velocity of the ship in still water is V2 = 3m / s, and the course of the ship forms a 30 degree angle with the upstream bank (2) Right across the bank (3) How can the course reach the opposite shore (4) What is the shortest way to cross the river

Partial velocity of vertical bank = 3 * sin30 = 1.5m/s
t=300/1.5=200s
Partial velocity of parallel river bank v = 3 ^ 1.5/2-1
s=vt
For the opposite bank, it is required that the partial velocity of the parallel bank = the flow velocity = 1m / s
The shortest time is to sail perpendicular to the river bank, and the vertical speed is v = 3m / s
t=s/v