Answer:
Step-by-step explanation:
Using vector method to solve it
Resultant can be given by


R=671.12 Km/hr
The angle made by resultant with 700 km/hr is 
using sine rule



Kinda late, but do you have the area of the triangle?
38.1 seconds I believe simply divide 4m/s into 152.4 m and you will have 38.1 seconds