Question

Два катера одновременно отправились от одной пристани в одном направлении. Их скорость соответственно равны 20 км / ч и 30 км/ ч 1) Какое расстояние будет между ними через 1 час? через 1,5 час? 2)Через сколько часов расстояние между ними будет равно 25 км?

Answer 1

30-20=10км/ч скорость отдаления первого от второго
10*1=10км будет между ними через 1 час
10*1,5=15км будет между ними через 1,5ч
25:10=2,5ч время через которое расстояние между ними будет 25 км

Answer 2

1) (30-20)*1=10 км после 1 часа
    (30-20)*1,5=15 км через 1,5 часа
2)25:(30-20)=2,5 часа

Answer 3

Question 1:

The two boats are traveling in the same direction with speeds of 20 km/h and 30 km/h respectively. We need to find the distance between them after 1 hour and after 1.5 hours.

To find the distance between the boats after a certain time, we can use the formula: distance = speed * time.

1) After 1 hour: - Boat 1: distance = 20 km/h * 1 hour = 20 km - Boat 2: distance = 30 km/h * 1 hour = 30 km

2) After 1.5 hours: - Boat 1: distance = 20 km/h * 1.5 hours = 30 km - Boat 2: distance = 30 km/h * 1.5 hours = 45 km

Question 2:

We need to find the time it takes for the distance between the boats to be equal to 25 km.

Let's assume that the boats have traveled for 't' hours. The distance traveled by each boat can be calculated using the formula: distance = speed * time.

- Boat 1: distance = 20 km/h * t hours - Boat 2: distance = 30 km/h * t hours

To find the time when the distance between them is 25 km, we can set up the equation: 20t - 30t = 25.

Simplifying the equation, we get: -10t = 25.

Dividing both sides by -10, we find: t = -2.5.

Since time cannot be negative, we can conclude that the distance between the boats will never be equal to 25 km.

Please let me know if I can help you with anything else.