Question

из двух городов расстояние между которыми 1420км или одновремено навстречу друг другу два теплохода и встретились через 20 ч скорость одного теплохода 31 км ч найди скорость С решением и краткой записи

Answer 1

Ответ:

Пошаговое объяснение:

дано:

S 1420км

t 20 час

V1 31 Км/час

V2 ? км/час

V=S:t

1420÷20=71км /час общая скорость

71-31=40км/час скорость 2 теплохода

Answer 2

Problem Analysis

We have two ships traveling towards each other from two cities that are 1420 km apart. They meet after 20 hours. The speed of one ship is given as 31 km/h. We need to find the speed of the other ship.

Solution

Let's assume the speed of the other ship is S km/h.

The total distance traveled by the first ship in 20 hours is 31 km/h * 20 h = 620 km.

The total distance traveled by the second ship in 20 hours is S km/h * 20 h = 20S km.

Since the two ships meet, the sum of the distances traveled by both ships should be equal to the total distance between the cities, which is 1420 km.

Therefore, we can write the equation: 620 km + 20S km = 1420 km.

To find the value of S, we can solve this equation.

Solving the Equation

Let's solve the equation step by step:

620 km + 20S km = 1420 km

Subtract 620 km from both sides:

20S km = 1420 km - 620 km

20S km = 800 km

Divide both sides by 20:

S km = 800 km / 20

S km = 40 km/h

Answer

The speed of the second ship is 40 km/h.

Solution Summary

The speed of the second ship is found to be 40 km/h. We solved the equation by subtracting 620 km from both sides and then dividing both sides by 20. The detailed solution steps are provided above.