10. a boat covers a distance of 24 km upstream in 3 hrs. if stream flows at 4 km/h, find the speed of the boat in still water.

Let the speed of boat in still water = x km/hspeed of stream = 4 km/hNow, speed in upstream = x-4 km/hTime taken to cover 24 km upstream = 3 hrs24x - 4 = 33x - 12 = 243x = 36x = 12So, speed of boat in still water = 12 km/h

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