Pinky can swim 27 km downstream or 15 km upstream in 3 hours. What is…

Let,

x = speed of the object

y = velocity of the current

Downstream = x + y

Upstream = x - y

So, Downstream speed = \(\frac{27}{3}\)= 9 km/h

Upstream speed = \(\frac{15}{3}\) = 5 km/h

So,

x + y = 9

x - y = 5

So,  2y = 4

y = 2 km/h