Question

В цистерну через две трубы налили 2.28 т.бензина.Через первую трубу поступало 3.6 т. бензина в час., и она была открыта 0.4 ч. Через вторую трубу поступало за час на 0.8 т. бензина меньше, чем через первую. Сколько времени была открыта вторая труба?

Answer 1

Решение: через первую трубу поступило 3,6 х 0,4 = 1,44 т бензина.
Через вторую трубу поступило 2,28 - 1,44 + 0,84 т бензина.
Производительность второй трубы 3,6 - 0,8 = 2,8 т/ч.
Вторая труба была открыта 0,84 : 2,8 = 0,3 часа.

Answer 2

1)3.6-0.8=2.8(б/ч)-поступало через 2 трубу

2)3.6*0.4=1.44(б)-всего через 1 трубу

3)2.28-1.44=0.84(б)-всего через 2 трубу

4)0.84/2.8=8.4/28=0.3(ч)-открыта 2 труба

 

Answer 3

Problem Analysis

We are given the following information: - Two pipes are used to fill a tank with 2.28 tons of gasoline. - The first pipe fills the tank at a rate of 3.6 tons per hour and is open for 0.4 hours. - The second pipe fills the tank at a rate 0.8 tons per hour less than the first pipe.

We need to determine how long the second pipe was open.

Solution

Let's calculate the amount of gasoline filled by the first pipe in 0.4 hours: - The rate of the first pipe is 3.6 tons per hour. - The time the first pipe was open is 0.4 hours.

Using the formula: amount = rate * time, we can calculate the amount of gasoline filled by the first pipe: amount_filled_by_first_pipe = 3.6 tons/hour * 0.4 hours

Next, let's calculate the amount of gasoline filled by the second pipe in 1 hour: - The rate of the second pipe is 0.8 tons per hour less than the rate of the first pipe.

Using the formula: amount = rate * time, we can calculate the amount of gasoline filled by the second pipe: amount_filled_by_second_pipe = (3.6 tons/hour - 0.8 tons/hour) * 1 hour

We are given that the total amount of gasoline filled in the tank is 2.28 tons. Therefore, the sum of the amounts filled by the first and second pipes should be equal to 2.28 tons.

Let's set up the equation and solve for the time the second pipe was open: amount_filled_by_first_pipe + amount_filled_by_second_pipe = 2.28 tons

Substituting the calculated values, we have: (3.6 tons/hour * 0.4 hours) + ((3.6 tons/hour - 0.8 tons/hour) * 1 hour) = 2.28 tons

Now, we can solve this equation to find the time the second pipe was open.

Calculation

Let's calculate the time the second pipe was open:

amount_filled_by_first_pipe = 3.6 tons/hour * 0.4 hours = 1.44 tons

amount_filled_by_second_pipe = (3.6 tons/hour - 0.8 tons/hour) * 1 hour = 2.8 tons

Equation: 1.44 tons + 2.8 tons = 2.28 tons

Simplifying the equation: 4.24 tons = 2.28 tons

Therefore, the equation is not satisfied, which means there might be an error in the given information or calculations.

Conclusion

Based on the given information and calculations, it seems that there is an error or inconsistency in the problem statement or calculations. The equation does not hold true, indicating that the given information may not be accurate or there might be a mistake in the calculations. It is recommended to review the problem statement and calculations to identify and correct any errors.