Some friends went hiking for 3.5 hours. They traveled 21 kilometers in that time. Birgit was 4 minutes/km faster than the average time. If Birgit kept the same pace, how many minutes would it take her to go 8 kilometers?
Minutes spent hiking = 3.5*60 = <T>multiply(3.5, 60)=210.0 minutes
Average speed = 210 minutes/ 21 km = <T>divide(210, 21)=10.0 minutes/km
Birgit is 4 minutes/km faster = 10 - 4 = 6 min/km
It would take 6*8 = <T>multiply(6, 8)=48 minutes to go 8 km
Birgit would take 48 minutes to travel 8 kilometers.
