SOLUTION: Two trains are running in opposite directions with the same speed. If the length of each train is 180 metres and they cross each other in 12 seconds, then the speed of each train (

Algebra ->  Probability-and-statistics -> SOLUTION: Two trains are running in opposite directions with the same speed. If the length of each train is 180 metres and they cross each other in 12 seconds, then the speed of each train (      Log On


   

Question 1024328: Two trains are running in opposite directions with the same speed. If the length of each train is 180 metres and they cross each other in 12 seconds, then the speed of each train (in km/hr) is
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let the speed of the trains = +s+
The trains are passing eachother with
speed = +2s+
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In order to cross eachother, each train
covers +2%2A180+=+360+ m
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convert seconds to hrs:
+12%2A%281%2F60%29%2A%281%2F60%29+=+12%2F3600+
+12%2F3600+=+1%2F300+ hrs
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+360+=+2s%2A%28+1%2F300+%29+
+360+=+s%2A%28+1%2F150+%29+
+s+=+54000+ m/hr
+s+=+54+ km/hr
The speed of each train is 54 km/hr