The Cottage Grove Loop Line travels the distance between the north side and the south side of the city in two hours, at a rate of speed of 100 km/h. How long is a round trip, measured in kilometers?
Select the correct option
A) 100 km B) 150 km C) 200 km D) 300 km E) 400 km
Distance covered in 2 hours: 100 x 2 = 200 km   Duration of a return trip: 2 x 2 = 4 hours   Distance covered in 4 hours: 100 x 4 = 400 km   IMO, correct answer is "400 km."
<result>E</result>
The Cottage Grove Loop Line travels the distance between the north side and the south side of the city in two hours, at a rate of speed of 100 km/h. How long is a round trip, measured in kilometers?