diff --git a/practice/clock/clock.py b/practice/clock/clock.py
index 1102992..b701393 100644
--- a/practice/clock/clock.py
+++ b/practice/clock/clock.py
@@ -1,18 +1,109 @@
 class Clock:
+    """
+    A class to represent a 24-hour clock.
+
+    ...
+
+    Attributes
+    ----------
+    minutes : int
+        the total minutes past midnight
+
+    Methods
+    -------
+    __repr__():
+        Returns a string representation of the clock.
+    __str__():
+        Returns a string representation of the clock in HH:MM format.
+    __eq__(other):
+        Checks if this clock is equal to another clock.
+    __add__(minutes):
+        Adds a certain number of minutes to this clock.
+    __sub__(minutes):
+        Subtracts a certain number of minutes from this clock.
+    """
+
     def __init__(self, hour, minute):
-        pass
+        """
+        Constructs all the necessary attributes for the clock object.
+
+        Parameters
+        ----------
+            hour : int
+                the hour of the day
+            minute : int
+                the minute of the hour
+        """
+        self.minutes = (hour * 60 + minute) % 1440
 
     def __repr__(self):
-        pass
+        """
+        Returns a string representation of the clock.
+
+        Returns
+        -------
+        str
+            a string representation of the clock
+        """
+        return f"Clock({self.minutes // 60}, {self.minutes % 60})"
 
     def __str__(self):
-        pass
+        """
+        Returns a string representation of the clock in HH:MM format.
+
+        Returns
+        -------
+        str
+            a string representation of the clock in HH:MM format
+        """
+        return f"{self.minutes // 60:02d}:{self.minutes % 60:02d}"
 
     def __eq__(self, other):
-        pass
+        """
+        Checks if this clock is equal to another clock.
+
+        Parameters
+        ----------
+            other : Clock
+                the other clock to compare with
+
+        Returns
+        -------
+        bool
+            True if the clocks are equal, False otherwise
+        """
+        return self.minutes == other.minutes
 
     def __add__(self, minutes):
-        pass
+        """
+        Adds a certain number of minutes to this clock.
+
+        Parameters
+        ----------
+            minutes : int
+                the number of minutes to add
+
+        Returns
+        -------
+        Clock
+            a new clock with the added minutes
+        """
+        total_minutes = self.minutes + minutes
+        return Clock(total_minutes // 60, total_minutes % 60)
 
     def __sub__(self, minutes):
-        pass
+        """
+        Subtracts a certain number of minutes from this clock.
+
+        Parameters
+        ----------
+            minutes : int
+                the number of minutes to subtract
+
+        Returns
+        -------
+        Clock
+            a new clock with the subtracted minutes
+        """
+        total_minutes = self.minutes - minutes
+        return Clock(total_minutes // 60, total_minutes % 60)
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