A boat travels 60 km upstream

(against the current) in 5 hours.

The boat travels the same distance

downstream in 3 hours. What is the

rate of the boat in still water? What

is the rate of the current?

16 km/h ... still water boat rate

4 km/h ... Current rate

Step-by-step explanation:

The speed of the boat supposed to be x km/h

The current rate is y km/h

(x + Y) * 3 = 60

(x - y) * 5 = 60

3x + 3y = 60 ... ①

5x - 5y = 60 ... ②

① * 5 ... 15x + 15y = 300 ... ①'

② * 3 ... 15x - 15y = 180 ... ②'

①' - ②' ... 30y = 120

Y = 4 km/h ... Current rate

15x = 300 - 15*4 = 240

X = 16 km/h ... still water boat rate