A) 6.2 seconds
B) 5.9 seconds
C) 4.7 seconds
D) 5.4 seconds
E) 5.5 seconds
Correct Answer: D
Solution :
\[\text{Time=}\frac{\text{Total}\,\,\text{length}}{\text{Time}}=\frac{100+80}{120\times \frac{5}{18}}=\frac{180\times 18}{120\times 5}\] \[\text{=5}\text{.4 seconds}\]
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