A) 1 h
B) 1 h 12 min
C) 1 h 15 min
D) 1 h 20 min
Correct Answer: B
Solution :
Since, speed and time are inversely proportional to each other. According to the given condition, Usual time\[-\frac{6}{7}\times \]Usual time=12 \[\therefore \] \[\frac{1}{7}\times \]Usual time =12 \[\therefore \] Usual time = 72 min = 1 h 12 minYou need to login to perform this action.
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