posted by Denny .
A river has a current of 5 m/s. A boat tries to head directly across at 4 m/s. When the boat reaches the other side it is 30m downstream.
How wide is the river ?
After reaching its highest point the blue ninja rocket's chute opens. If the rocket falls at a constant speed of 1.5 m/s. From the height of 300m in a cross wind of 4 m/s.
Hoe far down wind does the rocket travel from the launch pad?