Question

The speed of a boat in still water is 10 km/hr. If it can travel 78 km downstream and 42 km upstream in the same time, the speed of the stream is ​

Answer 1

Answer:

3km/h

Step-by-step explanation:

Let the speed of the stream be x km/hr

Let the speed of the stream be x km/hrThen speed downstream = (10 + x) km/hr

Let the speed of the stream be x km/hrThen speed downstream = (10 + x) km/hrSpeed upstream

Let the speed of the stream be x km/hrThen speed downstream = (10 + x) km/hrSpeed upstream = (10−x)km/hr∴26(10+x)=14(10−x)⇒260−26x=140+14x⇒40x=120⇒x=3km/hr

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