Answer:
The speed before flying into the head winds was 79.2 mph.
Step-by-step explanation:
These measures can be related the following way:
In which v is the speed, s is the distance and t is the time.
If it took the plane 5 hours to travel 1,380 miles.
This means that the AVERAGE speed was:
mph
There are two intervals(First two hours, last three hours).
The first two hours have an average speed of a, and the last three hours have an average speed of b = a-40.
276 is the weighed average. So:
mph
The speed before flying into the head winds was 79.2 mph.