Question

A motor boat whose speed is 15km/h in still water takes 2 hour more to go 21 km upstream than to return downsream to the same spot .let the speed of the stream be x.represent this situation algebraically

Answer 1

Answer:

Let the speed of stream be x km/h

Speed downstream= (15+x)km/h

Speed upstream= (15-x)km/h

Therefore, 30/15+x + 30/15-x =4½

900/225-x²=9/2

9x²=225

x²=25

x= 5km/hr

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Step-by-step explanation:

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