Question 60
Find the speed of a boat in still water if the boat goes 12 km/h along the stream and 4 km/h against the stream.
Solution
Let's assume the speed of boat in still water and the speed of stream are 'B' and 'C' respectively.
the boat goes 12 km/h along the stream and 4 km/h against the stream.
B+C = 12 Eq.(i)
B-C = 4 Eq.(ii)
Add Eq.(i) and Eq.(ii).
B+C+B-C = 12+4
2B = 16
speed of a boat in still water = B = 8 km/h
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