Question
The speed of a boat in still water is 45 km/hr, and the
speed of the stream is 5 km/hr. The boat takes 30 minutes longer to cover a distance of x km upstream than it takes downstream. Find the value of 3.5xSolution
Upstream speed of boat = 45 – 5 = 40km/hr. Downstream speed of boat = 45 + 5 = 50km/hr. 
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