Using the time-travel graph below, how long does it take a P wave to travel 2000 km? 
Definitions:
DSO
Days Sales Outstanding (DSO) is a financial metric that calculates the average time in days that a company takes to collect payment after a sale has been made, indicating the efficiency of the company's credit and collections policies.
CCC
Cash Conversion Cycle, a metric that shows the time span between a company's outlay of cash for materials and receiving payment from the sale of goods.
Permanent Net Operating Working Capital
The continuous investment in operating working capital that is not expected to fluctuate over the business cycle.
Seasonal
The term seasonal refers to fluctuations in demand, supply, or particular phenomena that recur with similar patterns at certain times of the year.
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