# The boat sailed 72 km downstream in 2 hours and upstream in 3 hours. in how many

The boat sailed 72 km downstream in 2 hours and upstream in 3 hours. in how many hours will the rafts travel this distance?

Boat speed downstream:
V1 = 72/2 = 36 km / h.
Boat speed upstream:
V1 = 72/3 = 24 km / h.
Let the speed of the boat = x, the speed of the river = y.
Driving the boat downstream:
x + y = 36
The movement of the boat against the current
x-y = 24
Let’s solve the equations together:
x + y = 36 (1)
x-y = 24 (2)
From here
2x = 60
X = 30 km / h. – boat speed.
From equation 2 we find the flow rate
30-24 = 6 km / h.
Rafts float with the current, at the speed of the current of water.
t = V / s where t is time, V is speed, S is distance
t = 72/6 = 12 (h)
The rafts will cover the distance of 72 km in 12 hours.

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