A) 7.4 s
B) 7.2 s
C) 7 s
D) 6.8 s
Correct Answer: B
Solution :
Relative speed \[=75+50=\frac{125\times 5}{18}\text{m/s}\] and total covered distance \[=100\,m+150\,m\] \[=250\,m\] \[\therefore \] Time taken to cross each other \[\text{=}\frac{\text{Total covered distance}}{\text{Relative speed}}\] \[=\frac{250\times 18}{125\times 5}=7.2\,s\]You need to login to perform this action.
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