A) 48 km/h
B) 54 km/h
C) 66 km/h
D) 82 km/h
Correct Answer: D
Solution :
[d] Let the speed of the second train be x km/h The relative speed = (50 + x) km/h These trains will cross each other in a time equivalent of covering a distance equal to 108 + 112, i.e. 220 meters in 6 seconds, running a speed of (50 + x) km/h \[\therefore \] \[\frac{1}{50+x}\times \frac{220}{1000}=\frac{6}{3600}\] \[\Rightarrow \] \[x=82\] \[\therefore \] The speed of the second train = 82 km/h.
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