Question

canoeing on a river

Two students are canoeing on a river. While heading upstream,they accidentally drop an empty bottle overboard. They thencontinue paddling for 1.5 {rm h}, reaching a point1.5 {rm km} fartherupstream. At this point they realize thatthe bottle is missing and, driven by ecological awareness, theyturn around and head downstream. They catch up with andretrievethe bottle (which has been moving along with the current)4.6 {rm km} downstream from the turn-around point.1) Assuming a constant paddling effort throughout, how fast isthe river flowing?2)What would the canoe speed in a still lake befor the same paddling effort?

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