A) 5 m/s, 10 m/s
B) 10 m/s, 30 m/s
C) 15 m/s, 5 m/s
D) 20 m/s, 21 m/s
E) 10 m/s, 5 m/s
Correct Answer: B
Solution :
Let velocities of two trains be u and v. Relative velocity while overtaking\[=u-v\] Relative velocity while crossing\[=u+v\] Distance travelled in each case \[=200+200=400m\] \[\therefore \] \[20=\frac{400}{u-v}\] \[\therefore \] \[u-v=\frac{400}{20}=20\] ?.. (1) \[u+v=\frac{400}{10}=40\] ...(2) From Eqs. (1) and (2), we get \[u=30m/s,\text{ }v=10m/s\]You need to login to perform this action.
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