4. When Tina went for a walk, she covered the first 300 m in 100 s and the next 200 m in 150 s. What was Tina's average speed?
A 1 m/s
B 2 m/s
C 3 m/s
D 5 m/s

An uplifted block of rock between two normal faults

Idon’t quite understand this problem

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?