Question

Помогите пожалуйста))) СПАСИБО БОЛЬШОЕ! Катер шел 5 часов по течению реки и прошел 150 км,Сколько времени ему понадобится на обратный путь,если скорость течения реки 2,5 км\час

Answer 1

1) 150:5=30км/ч - скорость катера по течению
2) 30-2,5=27,5км/ч - собственная скорость катера
3) 27,5-2,5=25км/ч - скорость катера против течения
4) 150:25=6ч. - понадобится катеру на обратный путь

Answer 2

Calculation of Time for the Return Journey

To calculate the time it will take for the boat to return, we need to consider the speed of the boat and the speed of the river's current.

Given: - The boat traveled for 5 hours downstream and covered a distance of 150 km. - The speed of the river's current is 2.5 km/h.

To find the speed of the boat in still water, we can use the formula:

Speed of boat in still water = (Speed downstream + Speed upstream) / 2

Since the speed downstream is the speed of the boat plus the speed of the current, and the speed upstream is the speed of the boat minus the speed of the current, we can rewrite the formula as:

Speed of boat in still water = (Speed of boat + Speed of current + Speed of boat - Speed of current) / 2

Simplifying the equation, we get:

Speed of boat in still water = 2 * Speed of boat / 2

Therefore, the speed of the boat in still water is equal to the speed of the boat.

To find the speed of the boat, we can use the formula:

Speed of boat = Distance / Time

Since the boat traveled downstream for 5 hours and covered a distance of 150 km, we can rearrange the formula to solve for time:

Time = Distance / Speed

Substituting the given values, we have:

Time = 150 km / Speed of boat

To find the time it will take for the boat to return, we need to calculate the speed of the boat in still water.

Let's calculate the time for the return journey:

Time for the return journey = Distance / Speed of boat

Substituting the given values:

Time for the return journey = 150 km / Speed of boat

To calculate the speed of the boat in still water, we need to consider the speed of the current. Since the speed of the current is 2.5 km/h, we can calculate the speed of the boat in still water as follows:

Speed of boat in still water = Speed of boat + Speed of current

Substituting the given values:

Speed of boat in still water = Speed of boat + 2.5 km/h

Unfortunately, we don't have the exact speed of the boat or the speed of the current. Therefore, we cannot provide an exact answer to the question. However, you can use the formulas and the given information to calculate the time for the return journey once you have the speed of the boat in still water.

Please let me know if there's anything else I can help you with!