Question 389629
According to question, 

speed of boat in against the current = 60/5 =12 km/h

speed of boat with the current = 60/3 = 20 km/h


let the speed of boat in still water = x km/h  and rate of current is :  y km/h

then x+y =20...  (1)   (speed of boat with the current)

and x-y = 12 .... (2)    (speed against the current)

now, add these two equations..

2x =32  =>  x =16 

and y=4 

speed of boat in still water =16 km/h and speed of current is 4km/h.