Respuesta :
Answer:
120km
Step-by-step explanation:
10km in 15 min
3hrs = 3 x 60 min = 180 min
180min divided by 15min = 12
12 x 10km = 120 km
120 because the 15 divided by 180 is 12 and you multiply that by 10 to get the answer (the twelve represents twelve 15s)