i dont like it

src/uebung07/quantities/plain/Length.java

@@ -1,8 +1,8 @@
-package quantities.plain;
+package uebung07.quantities.plain;
 
-import static quantities.plain.LengthUnit.METER;
+import static uebung07.quantities.plain.LengthUnit.METER;
-import static quantities.plain.TimeUnit.SECOND;
+import static uebung07.quantities.plain.TimeUnit.SECOND;
-import static quantities.plain.VelocityUnit.METER_PER_SECOND;
+import static uebung07.quantities.plain.VelocityUnit.METER_PER_SECOND;
 
 public class Length extends Quantity {
     private final LengthUnit unit;

src/uebung07/quantities/plain/LengthUnit.java

@@ -1,4 +1,4 @@
-package quantities.plain;
+package uebung07.quantities.plain;
 
 public class LengthUnit extends Unit {
     public LengthUnit(String name, double baseFactor) {

src/uebung07/quantities/plain/Time.java

@@ -0,0 +1,41 @@
+package uebung07.quantities.plain;
+
+import static uebung07.quantities.plain.LengthUnit.METER;
+
+public class Time extends Quantity{
+    private final TimeUnit unit;
+
+    public Time(double value, TimeUnit unit) {
+        super(value, unit);
+        this.unit = unit;
+    }
+
+    public Time plus(Time other) {
+        return new Time( value + other.getBaseValue() / unit.baseFactor, unit);
+    }
+
+    public Time minus(Time other) {
+        return new Time( value - other.getBaseValue() / unit.baseFactor, unit);
+    }
+
+    public Time mult(double f) {
+        return new Time( value * f, unit);
+    }
+
+    public Time div(double f) {
+        return new Time( value / f, unit);
+    }
+
+    public Time to(TimeUnit unit) {
+        return new Time(getBaseValue() / unit.baseFactor, unit)
+    }
+
+    public double div(Time other) {
+        return getBaseValue() / other.getBaseValue();
+    }
+
+    public Length mult(Velocity v) {
+        return new Length(this.value(METER), METER);
+    }
+
+}

src/uebung07/quantities/plain/TimeUnit.java

@@ -0,0 +1,5 @@
+package uebung07.quantities.plain;
+
+public class TimeUnit extends Unit{
+
+}