Description

In an equation, operands are the numbers and operators are the actions aplied to them.
In the time calculator, each operand can consist of multiple values with different units.

The structure should look something like that:

Equation:
  List of Operators
Operator:
  Operation ( + | - |  * |  / )
  Left Operand
  Right Operand
Operand:
  List of Values
Value:
  Number ( double | float )
  Unit ( hour | min | sec | milisec | etc... )

Specifications

• The equation is structured like a binary tree.
• Each operation can also be an operand.
• A numeric value with the lowest common denominator should represent each Value to calculate the equation's result.
• Each step in the hierarchy should offer an accessible way to see the total sum of its parts.

Suggestions

• Using TimeSpan should simplify the representation of the value.