The speed of a boat in still water is \(27 \ km/hr\). It can go \(54 \ km\) upstream and return downstream to the original point in \(4\) hours \(30\) minutes. Form a quadratic equation in \(x\) based on the given information and analyze the nature of the roots of the quadratic equation and hence determine the speed of the stream.
Answer:
The speed of the stream is \(km/hr\).