At 3a.m. the water is at its lowest temperature.
After 10 hours have passed, the temperature of the lake water is 54 degrees.
How to find the complete information ?
According to the problem,
- The first temperature is recorded at 9 p.m.
- The lowest temperature is recorded after 6 hours
So, the lowest temperature is recorded at ( 9 p.m. + 6 hours) = 3 a.m.
Again,
- 7 a.m. is 10 hours passed 9 p.m.
- At that time temperature recorded was 54° F
So, After 10 hours have passed, the temperature of the lake water is 54 degrees.
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