The conversation took 6 minutes, which is 0.1 hours (since there are 60 minutes in an hour and 6/60 = 0.1).
The two people are valued at $50.00 per hour each, so together they are valued at $100.00 per hour.
Therefore, the cost of the conversation is:
Cost = Time x Hourly rate
Cost = 0.1 x $100.00
Cost = $10.00
So the conversation cost the company $10.00.