exam Maths Puzzle Numerical Ability

You are in a cave with 5 green- or blue-eyed people who can see in the dark. Green-eyed people always tell the truth; blue-eyed people always lie. A says: "I see three pairs of gre

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During the first part of a trip, a canoeist travels 54 miles at a certain speed. The canoeist travels 22 miles on the second part of the trip at a speed of 5 mph slower. The total time of the trip is 3 hours. What was the speed on each part of the trip? One eighth of the square root of 7 less than a number is 2. What is the number?
I also need the proof for it.
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