Question

Катер идёт от одной пристани к другой со скоростью 30км/ч а возвращается обратно со скоростью ? на 10км/ч большей.за какое время катер пройдёт весь путь туда и обратно,если расстояние между пристанимя 240км/ч

Answer 1

240:30=8ч на путь от одной пристани до другой
30+10=40 км в час скорость катера на обратном пути
240:40=6ч на обратный путь
8+6=14ч затратит на весь путь

Answer 2

240:30=8ч 
30+10=40 км/час
240:40=6ч 
8+6=14ч

Answer 3

Problem Analysis

We are given that a boat travels from one dock to another at a speed of 30 km/h and returns back 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: - Distance = 240 km - Speed = 30 km/h - Using the formula, time = distance / speed, we can calculate the time taken: time = 240 km / 30 km/h = 8 hours.

2. Time taken to return back from the second dock to the first dock: - Speed = 30 km/h + 10 km/h = 40 km/h (since the boat returns back at a speed that is 10 km/h faster) - Using the formula, time = distance / speed, we can calculate the time taken: time = 240 km / 40 km/h = 6 hours.

3. Total time taken for the round trip: - To find the total time, we add the time taken to travel from one dock to another and the time taken to return back: total time = 8 hours + 6 hours = 14 hours.

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

Answer

The boat will take a total of 14 hours to complete the round trip from one dock to another and back, given that the distance between the docks is 240 km.