The rates upstream and downstream of a swimmer are 10 kmph and 13 kmph respectively. The speed of current is
Let the speed of the current be c
Speed of the swimmer = s
s + c = 13 ..... (1)
s - c = 10 .......(2)
Subtracting (2) from (1), we get 2c = 3 or c = 1.5
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