Answer:
1.85 km
Step-by-step explanation:
You want the length of half the circumference of a circular track with a circumference of 3.7 km.
Semicircle
The extreme points on a circle are at opposite ends of a diameter. The distance along the circle from one of those points to the other is half the total circumference of the circle.
Half the length of the 3.7 km test track is ...
(3.7 km) × (1/2) = 1.85 km
The distance the car travels is 1.85 km.
