Alarge boulder falls from an underwater ledge and crashes on the floor of the ocean. a pod of dolphins is 800 meters away. determined how long it takes for the soundof the crash to reach the dolphins.
o.5 sec
o.3 sec
2.3 sec
1.9 sec

I believe its 0.5 seconds

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.