Question

Розвяжи задачу . Склади і розвяжи обернену задачу , в якій потрібно знайти відстань між пристанями. Із двох пристаней , відстань між якими 441 км , одночасно назустріч один одному вирушили два пароплави і зустрілися через 7 годин . Знайди швидкість першого пароплава , якщо швидкість другого - 28 км/год

Answer 1

1) 28*7=196 км - проехал 1-й за 7 часов
2) 441-196=245 км - проехал 2-й за 7 часов
3) 245:7=35 км/г -швiдкiсть першого

Answer 2

Problem Analysis

To solve this problem, we need to find the speed of the first steamboat. We are given that the distance between the two ports is 441 km, and two steamboats started simultaneously from each port and met after 7 hours. We are also given that the speed of the second steamboat is 28 km/h.

Solution

Let's assume the speed of the first steamboat is x km/h.

We can use the formula: distance = speed × time to find the distance traveled by each steamboat.

For the first steamboat: - Speed = x km/h - Time = 7 hours - Distance = x × 7 km

For the second steamboat: - Speed = 28 km/h - Time = 7 hours - Distance = 28 × 7 km

Since the total distance between the two ports is 441 km, we can set up the equation:

Distance of the first steamboat + Distance of the second steamboat = Total distance

x × 7 + 28 × 7 = 441

Simplifying the equation:

7x + 196 = 441

Subtracting 196 from both sides:

7x = 245

Dividing both sides by 7:

x = 35

Therefore, the speed of the first steamboat is 35 km/h.

Answer

The speed of the first steamboat is 35 km/h.