A) 7 sec
B) 8 sec
C) 10 sec
D) 9 sec
Correct Answer: D
Solution :
Distance \[=180\] meter And relative speed \[=80-8\] \[=72\,\,Km/hr\] \[=72\,\,\frac{5}{18}\] \[=20\,m/\sec .\] \[T=\frac{D}{S}=\frac{180}{20}=9\sec .\]You need to login to perform this action.
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