Question

пожалуйста помоги мне решить задачу. самолёт летел из Москвы в Иркутск. Сначала он летел 3 часа со скоростью 620 километров в час . а затем несколько часов со скоростью 600 километров час а в конце пути 4 часа со скоростью 493 километров в час. Во сколько часов назад тратит самолет на весь перелет если расстояние от Москвы до Иркутска 5032 км ?

Answer 1

1) 620*3 = 1860 КМ - 1Я ЧАСТЬ ПУТИ
2)493*4 = 1972 КМ - 3Я ЧАСТЬ ПУТИ
3) 5032-1860-1972 = 1200КМ - 2-Я ЧАСТЬ ПУТИ
)1200:600 = 2 ЧАСА - ПОТРАТИЛ НА 2Ю ЧАСТЬ ПУТИ
5)3+2+4 = 9 ЧАСОВ ОН ПОТРАТИЛ НА ВЕСЬ ПЕРЕЛЕТ

Answer 2

Problem Analysis

To solve this problem, we need to find the total time it takes for the plane to fly from Moscow to Irkutsk. The plane flies at different speeds for different durations of time. We are given the speeds and durations of each leg of the journey. We also know the total distance between Moscow and Irkutsk.

Solution

To find the total time, we need to calculate the time taken for each leg of the journey and then sum them up.

Let's break down the problem step by step:

1. Calculate the time taken for the first leg of the journey, where the plane flies at a speed of 620 kilometers per hour for 3 hours. - Time taken for the first leg = Distance / Speed = 620 km/h * 3 hours = 1860 km.

2. Calculate the time taken for the second leg of the journey, where the plane flies at a speed of 600 kilometers per hour for an unknown duration. - Let's assume the duration for the second leg is 'x' hours. - Time taken for the second leg = Distance / Speed = 600 km/h * x hours = 600x km.

3. Calculate the time taken for the third leg of the journey, where the plane flies at a speed of 493 kilometers per hour for 4 hours. - Time taken for the third leg = Distance / Speed = 493 km/h * 4 hours = 1972 km.

4. Now, we can set up an equation to find the value of 'x' (the duration of the second leg): - Total distance = Distance of the first leg + Distance of the second leg + Distance of the third leg. - Total distance = 1860 km + 600x km + 1972 km = 5032 km. - Solve the equation to find the value of 'x'.

5. Once we have the value of 'x', we can calculate the total time taken for the journey by summing up the time taken for each leg: - Total time = Time taken for the first leg + Time taken for the second leg + Time taken for the third leg.

Let's calculate the solution step by step:

1. Calculate the time taken for the first leg: - Time taken for the first leg = 1860 km / 620 km/h = 3 hours.

2. Calculate the time taken for the third leg: - Time taken for the third leg = 1972 km / 493 km/h = 4 hours.

3. Set up the equation to find the value of 'x': - 1860 km + 600x km + 1972 km = 5032 km. - Simplify the equation: 600x = 5032 km - 1860 km - 1972 km. - Simplify further: 600x = 1200 km. - Divide both sides by 600: x = 1200 km / 600 km = 2 hours.

4. Calculate the time taken for the second leg: - Time taken for the second leg = 600 km/h * 2 hours = 1200 km.

5. Calculate the total time taken for the journey: - Total time = 3 hours + 2 hours + 4 hours = 9 hours.

Therefore, the plane takes 9 hours to complete the entire journey from Moscow to Irkutsk.

Answer: The plane takes 9 hours to complete the entire journey from Moscow to Irkutsk.