A) 6 h
B) 3 h
C) 4 h
D) \[4\frac{1}{2}\text{h}\]
Correct Answer: A
Solution :
Total distance covered = Speed \[\times \]Time\[=40\times 9=360\,\,\text{km}\] \[\therefore \]The required time at 60 km/h \[=\frac{360}{60}=6\,\,\text{h}\]
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