Let's assume the average speed for the first part of the journey is x km/h. Since Kitty cycles the first 350 km at this speed, the time it takes her is 350/x hours.
For the second part of the journey, let's assume the average speed is y km/h. Since the distance traveled is the same for the second part of the journey, the time it takes her is also 350/y hours.
According to the given information, the average speed for the second part of the journey is 15 km/h less than that for the first part. This can be written as y = x - 15.
Since the time for both parts of the journey is the same, we can equate the two time expressions:
350/x = 350/y
Cross multiplying this equation, we get:
y * 350 = x * 350
Substituting y = x - 15, we get:
(x - 15) * 350 = x * 350
Expanding the equation, we get:
350x - 5250 = 350x
Subtracting 350x from both sides, we get:
-5250 = 0
This equation has no solution.
Therefore, there is no average speed for the second part of the journey.
Kitty cycles the first 350 km of a force and kilometre generator speed and average speed that is 15 km less than that for the first part of the general is taken the time for her travel part for her general is the same find the average speed for the second part of general
3 answers
A man is 6 time as old as his son 20 years later the man will be twice as old as his son find the age of man when his son was born
Let's assume the current age of the son is x.
According to the problem, the man is 6 times as old as his son, so the current age of the man is 6x.
In 20 years, the son's age will be x + 20, and the man's age will be 6x + 20.
The problem states that in 20 years, the man will be twice as old as his son, so we can write the equation:
6x + 20 = 2(x + 20)
Simplifying the equation, we get:
6x + 20 = 2x + 40
Subtracting 2x from both sides, we get:
4x + 20 = 40
Subtracting 20 from both sides, we get:
4x = 20
Dividing both sides by 4, we get:
x = 5
Therefore, the current age of the son is 5.
To find the age of the man when his son was born, we need to subtract the son's age from the current age of the man:
6x - x = 5 * 6 - 5 = 30 - 5 = 25
So, the man was 25 years old when his son was born.
According to the problem, the man is 6 times as old as his son, so the current age of the man is 6x.
In 20 years, the son's age will be x + 20, and the man's age will be 6x + 20.
The problem states that in 20 years, the man will be twice as old as his son, so we can write the equation:
6x + 20 = 2(x + 20)
Simplifying the equation, we get:
6x + 20 = 2x + 40
Subtracting 2x from both sides, we get:
4x + 20 = 40
Subtracting 20 from both sides, we get:
4x = 20
Dividing both sides by 4, we get:
x = 5
Therefore, the current age of the son is 5.
To find the age of the man when his son was born, we need to subtract the son's age from the current age of the man:
6x - x = 5 * 6 - 5 = 30 - 5 = 25
So, the man was 25 years old when his son was born.