Answer:
You drive altogether 16.7 kilometers since you pick up the customer and leave the buggy in the car park
Step-by-step explanation:
First travel to the customer 5.9 + aid station 4 + car park 6.8 = total travel
[tex]T_{total} = 5.9 km + 4 km + 6.8 km \\T_{total} = 16.7 km \\[/tex]