The speed Hooghly river is 5 km/hr. A boat travels 28 km upstream and then returns downstream to the starting point. If its speed in still water be 9 km/hr, find the total journey time.

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The speed Hooghly river is 5 km/hr. A boat travels 28 km upstream and then returns downstream to the starting point. If its speed in still water be 9 km/hr, find the total journey time.






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