Question

Катер идет от одной пристани к другой со скоростью 30км.ч.,а возвращается обратно со скоростью на 10км.ч. больше.за какое время катер пройдет весь путь туда и обратно,если расстояние между пристанями 240км.ч.??? действия с вопросами пж помогите мне на тренеровку через 20 минут

Answer 1

240/30=8мин
240/(30+10)=6мин
8+6=14мин

Answer 2

Problem Analysis

We are given that a boat travels from one dock to another at a speed of 30 km/h and returns at a speed that is 10 km/h faster. We need to find the total time it takes for the boat to complete the round trip, given that the distance between the docks is 240 km.

Solution

To solve this problem, we can use the formula: time = distance / speed.

Let's break down the problem into steps:

1. Calculate the time it takes for the boat to travel from one dock to another at a speed of 30 km/h. 2. Calculate the time it takes for the boat to return from the second dock to the first dock at a speed that is 10 km/h faster. 3. Add the times from steps 1 and 2 to find the total time for the round trip.

Step 1: Calculate the time to travel from one dock to another

The distance between the docks is 240 km and the speed of the boat is 30 km/h. We can use the formula time = distance / speed to calculate the time it takes for the boat to travel from one dock to another.

Plugging in the values, we get: time = 240 km / 30 km/h = 8 hours.

Step 2: Calculate the time to return from the second dock to the first dock

The speed of the boat on the return trip is 10 km/h faster than the speed on the outbound trip. Therefore, the speed on the return trip is 30 km/h + 10 km/h = 40 km/h.

Using the same formula, time = distance / speed, we can calculate the time it takes for the boat to return from the second dock to the first dock.

Plugging in the values, we get: time = 240 km / 40 km/h = 6 hours.

Step 3: Calculate the total time for the round trip

To find the total time for the round trip, we need to add the times from steps 1 and 2.

Total time = time from step 1 + time from step 2 = 8 hours + 6 hours = 14 hours.

Therefore, the boat will take 14 hours to complete the entire round trip from one dock to another and back, given that the distance between the docks is 240 km and the boat travels at a speed of 30 km/h on the outbound trip and 40 km/h on the return trip.

I hope this helps! Let me know if you have any further questions.