A) 30 km/hr
B) 32 km/hr
C) \[32\frac{8}{11}\,\,Km/hr\]
D) \[35\frac{8}{11}\,\,Km/hr\]
Correct Answer: D
Solution :
[d] If the speed of the train be x kmph, then relative speed \[=(x-\,3)\,kmph.\] \[=(x-\,3)\times \frac{5}{8}m/\sec \] \[\therefore \frac{300}{(x-\,3)\times \frac{5}{18}}=33\] \[\Rightarrow 5400=33\times 5\,\,(x-3)\] \[\Rightarrow 360=11\,\,(x-3)\] \[\Rightarrow 11x-\,33=360\] \[\Rightarrow x=\frac{393}{11}=35\frac{8}{11}kmph\]You need to login to perform this action.
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