A river flows due east at 1.43 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.5 m/s...

A river flows due east at 1.43 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.5 m/s due north relative to the water. (a) What is the velocity of the boat relative to shore?(b) If the river is 261 m wide, how far downstream has the boat moved by the time it reaches the north shore?