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A passenger ship and a motorboat were sailing from port X to port Y which was situated 650 km away.
The ship left port X at 4 a.m. which was 4`1/4` h after a motorboat had left port X.
However, the ship arrived at its destination 2`3/4` h earlier than the motorboat.
The motorboat travelled at an average speed of 32.5 km/h.
Determine the average speed of the passenger ship.