A) 5 m/s
B) 10 m/s
C) 15 m/s
D) 20 m/s
Correct Answer: A
Solution :
The speeds of the train be a m/s and to b m/s, when they are moving in the same direction. Relative speed \[(a-b)\]m/s \[\therefore \] \[a-b=\frac{100+80}{18}=10\] ?(i) Similarly, \[a+b=\frac{100+80}{9}=20\] ...(ii) By solving Eg. (i) and Eq. (ii), we get a = 15 m/s and b = 5 m/sYou need to login to perform this action.
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