Question

Катер идёт от одной пристани к другой со скоростью 30 км ч,а возвращается обратно со скоростью на 10 км ч больше. За какое время катер пройдёт весь путь туда и обратно,если расстояние между пристанями 240 км ч.

Answer 1

1) 240:30=8 ч
2) 240:40=6 ч
3) 8+6=14 ч
ответ: Катер потратит 14 часов.

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 calculate the time it takes for the boat to travel from one dock to another and back.

1. Time taken to travel from one dock to another: - Speed = 30 km/h - Distance = 240 km - Time = Distance / Speed = 240 km / 30 km/h = 8 hours.

2. Time taken to return from the second dock to the first dock: - Speed = 30 km/h + 10 km/h = 40 km/h (10 km/h faster than the previous speed) - Distance = 240 km - Time = Distance / Speed = 240 km / 40 km/h = 6 hours.

3. Total time for the round trip: - Time taken to travel from one dock to another = 8 hours - Time taken to return from the second dock to the first dock = 6 hours - Total time = 8 hours + 6 hours = 14 hours.

Therefore, the boat will take a total of 14 hours to complete the round trip.

Conclusion

The boat will take a total of 14 hours to complete the round trip, traveling from one dock to another at a speed of 30 km/h and returning at a speed that is 10 km/h faster. The distance between the docks is given as 240 km.