SOLUTION: A Coast Guard ship made a trip to NYC and back. The trip there took 3 hours and the return trip took 4 hours and the return trip took 4 hours. It averaged 6 knots on the return tr

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Question 640168: A Coast Guard ship made a trip to NYC and back. The trip there took 3 hours and the return trip took 4 hours and the return trip took 4 hours. It averaged 6 knots on the return trip. Find the average speed of the trip there.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +d+ = distance to NYC
Let +s+ = the speed in knots for trip to NYC
given:
trip to NYC:
+d+=+s%2A3+
trip back:
+d+=+6%2A4+
+d+=+24+
By substitution:
+24+=+s%2A3+
+s+=+8+
The speed of the trip there is 8 knots