A jet airliner moving initially at 915 mph (with respect to the ground) to the east moves
into a region where the wind is blowing at
319 mph in a direction 78° north of east.
What is the new speed of the aircraft with
respect to the ground?
Answer in units of mph

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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