Question

Сколько км пройдет теплоход за 6 часов двигаясь против течения реки, если его собственная скорость 21 км ч, а скорость течения состовляет 2/7 собственной скорости теплохода

Answer 1

21/7=3
3*2=6
21-6=15
15*6= 90 км

Answer 2

Calculation of Distance Traveled by the Ship

To calculate the distance traveled by the ship in 6 hours while moving against the current of the river, we need to consider the ship's own speed and the speed of the current.

Given: - The ship's own speed is 21 km/h. - The speed of the current is 2/7 of the ship's own speed.

To calculate the effective speed of the ship against the current, we subtract the speed of the current from the ship's own speed:

Effective speed of the ship against the current = Ship's own speed - Speed of the current

Substituting the given values:

Effective speed of the ship against the current = 21 km/h - (2/7) * 21 km/h

Simplifying the expression:

Effective speed of the ship against the current = 21 km/h - (2/7) * 21 km/h = 21 km/h - (2/7) * 3 km/h = 21 km/h - 6 km/h = 15 km/h

Now, we can calculate the distance traveled by the ship in 6 hours using the formula:

Distance = Speed * Time

Substituting the values:

Distance = 15 km/h * 6 hours = 90 km

Therefore, the ship will travel 90 km in 6 hours while moving against the current of the river.