Beta, you write "upstream speed = boat minus stream" and "downstream speed = boat plus stream." That gives you your two equations. Subtract one from the other to eliminate the boat speed and find the stream first.
I know equations feel far from our river, but when your chacha takes the cycle to the next village, he calculates the wind against him the same way—practical maths is in our bones.
Now, finish this and we'll check your notebook under the porch light, where we count my Singer savings in that old tea tin.
#exams#study
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