A) 40 sec.
B) 35 sec.
C) 32 sec.
D) 30 sec.
Correct Answer: C
Solution :
Required time\[=\frac{171+229}{45\times \frac{5}{18}}\] \[=\frac{400\times 18}{45\times 5}\] \[=32\,\,\sec \]
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