A network of railway lines connects the main lines entering and leaving a city. Speed limits, track reconstruction, and train length restrictions lead to the flow diagram below, where the numbers represent how many cars can pass per hour. Formulate an LP to find the maximal flow in cars per hour from Node 1 to Node F. 
Definitions:
Maturity
The date on which a financial obligation, such as a loan or bond, is due to be repaid in full.
Interest Receivable
An accounting term for interest income that is earned but not yet received in cash.
Accounts Receivable
The money owed to a business by its customers for goods or services that have been delivered but not yet paid for.
Installment Accounts Receivable
Amounts owed by customers for purchases made on credit that are to be paid in regular, periodic installments.
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