A) 5
B) 6.5
C) 5.5
D) 8
E) 6
Correct Answer: B
Solution :
Rate upstream of boat \[=\frac{36}{5}=7.2\]kmph Speed of current = 2.4 kmph \[\therefore \] Speed of boat in still water = (7.2 + 2.4) kmph = 9.6 kmph \[\therefore \]Rate downstream of boat = (9.6 + 2.4) kmph =12kmph \[\therefore \]Time taken in covering 78 \[km=\frac{78}{12}=6.5\]hoursYou need to login to perform this action.
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