Answer:
11 mph
Step-by-step explanation:
Given that:
Average speed on the trip = 10 mph
Average speed on the way back = 22 mph
Let time taken on the trip to navigational buoy = [tex]t[/tex] hours
As per question statement, Time taken on the way back = [tex]t+6[/tex] hours
Formula used:
[tex]Distance = Speed \times Time[/tex]
The distance traveled on the way to navigational buoy and the distance traveled on the way back are traveled.
Writing equation:
[tex]22t=10(t+6)\\\Rightarrow 22t=10t+60\\\Rightarrow 22t-10t=60\\\Rightarrow 12t=60\\\Rightarrow t=5\ hours[/tex]
It is given that the time taken in the trip is 6 hours more than that of time taken on the way back.
So, time taken on the trip = 6 + 5 = 11 mph