A boat goes 12 km downstream and comes back to the starting point in 3 hours. If the speed of the current is 3 km/hr, then the speed (in km/hr) of the boat in still water is
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12 km to go down + 12 km to go up = 24 km in 3 hrs
3 km/hr × 3 = 9 km
24-9=15
15 km / 3hr = 5 km/hr
So the speed of the boat is 5 km/hr
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