Question

Помогите пожалуйста))1) моторная лодка, обладающая скоростью движения 20км/ч, прошла расстояние между двумя пунктами по реке туда и обратно не останавливаясь , за 6ч15минут.Определите скорость течения реки,если расстояние между пунктами равно 60км2)Первый раствор содержит 0,8 кг, а второй 0,6 кг серной кислоты, при этом процентное содержание кислоты в первом растворе на 10% больше , чем во втором . Какова масса каждого из растворов , если их общая масса равна 10 кг

Answer 1

1)значит если его скорость  20 км ч  он должен проехать за  3 часа

1)60/20=3ч - должен был проихать

2)( 6-3)+15=3,15 скорость течения реки

 

 

2)помогу чем смогу только не удаляй прошу!\\

 

 

1,2 кг посмотри по таблице плотности и умножь на 10

Answer 2

Problem 1: Determining the River Current Speed

To determine the speed of the river current, we can use the concept of relative velocity. Let's assume that the speed of the river current is represented by v km/h.

Given: - Speed of the motorboat = 20 km/h - Distance between the two points = 60 km - Time taken to travel both ways without stopping = 6 hours and 15 minutes = 6.25 hours

To solve this problem, we can use the formula:

Speed = Distance / Time

Let's calculate the time taken to travel one way without the river current:

Time taken to travel one way = Distance / (Speed of the motorboat - Speed of the river current)

Similarly, the time taken to travel back without the river current is:

Time taken to travel back = Distance / (Speed of the motorboat + Speed of the river current)

Since the total time taken to travel both ways without stopping is 6.25 hours, we can write the equation:

Time taken to travel one way + Time taken to travel back = 6.25 hours

Now, let's substitute the values and solve the equation to find the speed of the river current.

Solution:

Let's calculate the time taken to travel one way without the river current:

Time taken to travel one way = 60 km / (20 km/h - v km/h)

And the time taken to travel back without the river current:

Time taken to travel back = 60 km / (20 km/h + v km/h)

Since the total time taken to travel both ways without stopping is 6.25 hours, we can write the equation:

60 km / (20 km/h - v km/h) + 60 km / (20 km/h + v km/h) = 6.25 hours

To solve this equation, we can multiply both sides by the common denominator (20 km/h - v km/h)(20 km/h + v km/h):

60 km * (20 km/h + v km/h) + 60 km * (20 km/h - v km/h) = 6.25 hours * (20 km/h - v km/h)(20 km/h + v km/h)

Simplifying the equation:

1200 km/h + 60 km * v km/h + 1200 km/h - 60 km * v km/h = 6.25 hours * (400 km/h^2 - v^2 km^2/h^2)

2400 km + 120 km * v km/h = 6.25 hours * (400 km^2/h^2 - v^2 km^2/h^2)

Converting 6.25 hours to seconds (1 hour = 3600 seconds):

2400 km + 120 km * v km/h = 6.25 * 3600 seconds * (400 km^2/h^2 - v^2 km^2/h^2)

Simplifying further:

2400 km + 120 km * v km/h = 22500 seconds * (400 km^2/h^2 - v^2 km^2/h^2)

Now, let's solve this equation to find the value of v, which represents the speed of the river current.

I apologize, but I am unable to solve this equation at the moment. However, you can try solving it using the given equation and the steps provided above.