Determine the speed of the river, if the speed of the steamer along the current is 600 km / day, against – 336 km / day.

Let x km / day. is the steamer’s own speed, and y km / day. – the speed of the river. Then the speed of the steamer downstream is (x + y) km / h, and upstream – (x – y) km / h. Let’s solve the system of equations:

x + y = 600;

x – y = 336.

Let us subtract the second from the first equation and express the river speed y:

x + y – x + y = 600 – 336;

2y = 264;

y = 132 km / day.

Let’s translate the value of the river speed into SI:

132 km / day = 132 * 1000 / (24 * 3600) = 55/36 m / s = 1.53 m / s.