The Somari river flows at the rate of 5 km/hr. Setting out in his boat, Rohan takes 45 minutes to travel downstream (with the river's flow) to the small waterfall . On his way back, he takes an hour-and-a-half to get back to where he began from. How far is the waterfall from where Rohan began? Find the speed of the boat in still water.

The Somari river flows at the rate of 5 km/hr. Setting out in his boat

1.	The Somari river flows at the rate of 5 km/hr. Setting out in his boat, Rohan takes 45 minutes to travel downstream (with the river's flow) to the small waterfall . On his way back, he takes an hour-and-a-half to get back to where he began from. How far is the waterfall from where Rohan began? Find the speed of the boat in still water.
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