Question

1.
A sailor goes 8 cm. downstream: in 40 minutes and returns
in 1 hour. Determine the speed of sailor in still water and
the speed of the current.
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Answer 1

Your answer is in the photo

after seeing photo see this

from (1)

x+y=12

10 + y = 12

y=2km/hr

therefore speed of the current is 2km/hr.