Question

1.Найдите сумму 4-х чисел если их среднее арифметическое 4.0042.Дано:Vсобств.-15.4 км/чVпр.теч.-12.1км/чНайти Vтеч, по теч.Какое расстояние проплывет катер если будет двигаться 1.4ч по теч. реки?

Answer 1

(а+в+с+д):4=4,004

а+в+с+д=4,004*4

а+в+с+д= 16,016-сумма 4-х чисел.

 

2.

Vпр. теч = Vсоб. – Vтеч,отсюда узнаем

 Vтеч= Vсоб.- Vпр. теч 

15,4-12,1= 3,3км/ч-скорость течения.

 V по теч. = Vсоб. + Vтеч.

15,4+3,3= 18,7км/ч-скорость катера по течению.

18,7*1,4= 26,18км расстояние проплывет катер если будет двигаться по теч. реки.

 

Answer 2

Sum of Four Numbers with an Arithmetic Mean of 4.0042

To find the sum of four numbers given their arithmetic mean, we can multiply the mean by the number of values. In this case, the arithmetic mean is 4.0042, and we have four numbers. Therefore, the sum of the four numbers can be calculated as follows:

Sum = Mean * Number of Values

Substituting the given values:

Sum = 4.0042 * 4

Calculating the sum:

Sum = 16.0168

Therefore, the sum of the four numbers is 16.0168.

Calculating the Speed of a Boat in Still Water

To calculate the speed of a boat in still water, we need to consider the boat's speed relative to the water and the speed of the current. Let's denote the speed of the boat in still water as Vсобств. and the speed of the current as Vпр.теч.

The speed of the boat in the direction of the current, denoted as Vтеч, can be calculated using the formula:

Vтеч = Vсобств. + Vпр.теч.

Substituting the given values:

Vтеч = -15.4 km/h + (-12.1 km/h)

Calculating the speed of the boat in the direction of the current:

Vтеч = -27.5 km/h

Therefore, the speed of the boat in the direction of the current is -27.5 km/h.

Calculating the Distance Traveled by the Boat

To calculate the distance traveled by the boat when it moves for 1.4 hours in the direction of the current, we can use the formula:

Distance = Speed * Time

Substituting the given values:

Distance = -27.5 km/h * 1.4 h

Calculating the distance traveled by the boat:

Distance = -38.5 km

Therefore, the boat will travel a distance of -38.5 km when it moves for 1.4 hours in the direction of the current.

Please note that the negative sign indicates that the boat is moving against the current.