Matematik
Hvem kom først?
X and Y is the bike ride. They will run 40 km.
Y is running the first 20 km with an average speed of 30 km / h.
X runs every 40 km with an average speed of 25 km / h.
Y forget to economize with forces and proceed to the cold. His average speed drops to 20 km / h for the last 20 km.
Who came first?
Svar #1
13. november 2009 af Tuttehønen (Slettet)
X runs 40 km at avg speed of 25 km/hr
Time(x) = 40km / 25km/hr = 1.6 hrs = 1 hour, 36 min
Y runs 20 km at avg speed of 30 km/hr
time for first 20 km = 20km / 30km/hr = 2/3 hr = 40 min
Y runs 20 km at avg speed of 20 km/hr
time for second 20 km = 20km / 20km/hr = 1 hour
Time(y) = 1 hour, 40 min
So runner X comes first by 4 minutes
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