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

September 30, 2021 | education

| **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.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.