A) 5 sec
B) 6 sec
C) 7 sec
D) 8 sec
Correct Answer: B
Solution :
Required Time \[=\frac{105+90}{(45+72)\times \frac{5}{18}}\] \[=\frac{195\times 18}{117\times 5}\] \[=6\,\,\text{seconds}\]You need to login to perform this action.
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