A) 15 min
B) 25 min
C) 50 min
D) \[1\frac{1}{2}\]h
Correct Answer: C
Solution :
Time taken to cover 20 km at the speed of 5 km/h = 4 h \[\therefore \]Fixed time\[=4\,\,h-40\,\,\min \]= 3 h 20 min Time taken to cover 20 km at the speed of 8 km/h \[=\frac{20}{8}\] 2 h 30 min \[\therefore \]Required time = 3 h 20 min - 2 h 30 min = 50 minYou need to login to perform this action.
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