Question

Два екскурсійні автобуси одночасно виїхали із Запоріжжя до Києва. Швидкість одного на 15 км/год більша від швидкості другого автобуса. Через скільки годин відстань між ними буде 30 км?

Answer 1

Ответ:

1)72+9=81 км/год

2)458:81=5,(6) км

3)81-5,(6)=75,4

Вiдповiдь:75,4

Answer 2

To find the time it takes for the distance between two buses to be 30 km, we can set up an equation based on their speeds and time traveled. Let's assume that the slower bus has a speed of x km/h, and the faster bus has a speed of (x + 15) km/h.

The distance traveled by the slower bus after t hours is given by the equation: Distance = Speed * Time D1 = x * t

The distance traveled by the faster bus after t hours is given by the equation: Distance = Speed * Time D2 = (x + 15) * t

We want to find the time when the distance between them is 30 km. So we can set up the equation: D2 - D1 = 30

Substituting the expressions for D1 and D2, we get: (x + 15) * t - x * t = 30

Simplifying the equation, we have: 15t = 30

Dividing both sides by 15, we find: t = 2

Therefore, the distance between the two buses will be 30 km after 2 hours.

Note: This answer is based on the assumption that the speeds of the buses remain constant throughout the journey.