A) 75 km/hour
B) 80 kin/hour
C) 85 km/hour
D) 90 kin/hour
Correct Answer: C
Solution :
Speed of train \[=x\text{ }kmph\] \[\therefore \] Relative speed \[=(x+5)\,kmph\] \[\therefore \] Relative speed \[=\frac{Length\text{ }of\text{ }train}{Time\text{ }taken\text{ }in\text{ }crossing}\] \[\Rightarrow \] \[x+5=90\] \[\Rightarrow \] \[x=90-5=85\,kmph\]You need to login to perform this action.
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