Speed of the boat upstream is (y - 3) kmph and speed of the boat downstream is (y + 3) kmph.If the boat covers 84 km with speed of boat in still water in 7 hours. Total time taken by the boat to travel 120 km upstream and D km downstream. Is 58/3 hours. Find the value of D.

1
125 km
2
120 km
3
90 km
4
75 km
5
60 km

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