Answer: 64.8 mph
Step-by-step explanation:
Given
Arriving time is 6 hours
return time is 4 hours
The average speed of returning 81 mph
Distance traveled while returning

the average speed of the entire trip is

Answer:
Ty, you too!
Step-by-step explanation:
Hope you have a good day.
It's A ...cos (90- theta) = sin theta
so A