Answer:
Explanation:
Use vector addition
v = √(30² + 40²) = 50 m/s as viewed from the shore
Trust me when I say I would never venture onto a river moving at 30 m/s no matter how powerful the boat was.
30 m/s(3600 s/hr / 1000 m/km) = 108 km/hr
The turbulence in water flowing over ground at 108 kilometers per hour would capsize anything ever built...including aircraft carriers.
These numbers are more suitable for a plane flying in air. Even that could be a very rough ride.
