AFCAT I 2018 Solved Paper

Let speed of the boat in still water be x km/h and speedof current be y km/h.
Then,
upstream speed = (x – y) km/h
and down stream speed = (x + y) km/h
Now,

15

(x−y)

+

21

2(x+y)

= 3

1

4

.... (i)

12

(x−y)

+

14

(x+y)

= 3 ..... (ii)
From Equation (i) and (ii)
x = 10 km/hr and y = 4 km/hr.