Matematică, întrebare adresată de Cupcake1111, 9 ani în urmă

Annabelle is taking the train to see her boyfriend on Valentine's day! The train is 100 meters long and it takes 30 seconds to cross a 400m bridge. What speed is the train going at?


Răspunsuri la întrebare

Răspuns de MindShift
1
Length of the train= 100m 
t= 30 sec
Bridge length= 400m

Speed=Total distance/Time

Total distance=length of bridge +length of train
=400+100=500m

Speed=500/30 =50/3 m/s
1km/hr=5/18 m/s

Speed=50x18/15=60km/hr
Speed of train=60km/hr
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