Answer:
Step-by-step explanation:
Let x be the speed of first ferry.
Then the speed of second slower ferry is x-5 (since 5 miles per hour slower)
Time taken by first ferry = distance/speed =
Time taken by second ferry =
Since second ferry starts one hour early, difference in times is 1 hour.
Speed cannot be negative.
Hence answer is speed of the first ferry = 18.5 mph
and second ferry i.e. slower ferry is = 13.5 mph