Question

26. Відстань між пристанями дорівнює 138,6 км.швидкість моторного човна в стоячій воді становить 13,3 км/год, а швидкість течії- 0,7км/год. Скільки часу потрібно моторному човну ,щоб проплисти від однієї пристані до іншої та повернутись назад?

Answer 1

1) 13,3+0,7= 14(км/ч)- скорость по течению
2)13,3-0,7=12,6 (км/ч) - скорость против течения
3)138,6:14=9,9(час)- нужно чтобы проплыть по течению
4) 138,6:12,6=11 (час)- нужно чтобы проплыть против течения

Answer 2

13,3+0,7=14км/ч скорость по течению
138,6:14=9,9ч время по течению
13,3-0,7=12,6км/ч скорость против течения
138,6:12,6=11ч время против течения
9,9+11=20,9ч время на весь путь

Answer 3

Calculation of Time Required for Motorboat to Travel between Two Ports and Return

To calculate the time required for a motorboat to travel from one port to another and return, we need to consider the distance between the ports, the speed of the motorboat in still water, and the speed of the current.

Given information: - Distance between the ports: 138.6 km - Speed of the motorboat in still water: 13.3 km/h - Speed of the current: 0.7 km/h

To find the time required for the motorboat to travel from one port to another and return, we can use the formula:

Time = Distance / Speed

Let's calculate the time required for the motorboat to travel from one port to another and return.

1. Time required to travel from one port to another: - Distance: 138.6 km - Speed of the motorboat in still water: 13.3 km/h - Speed of the current: 0.7 km/h

Using the formula, we can calculate the time required to travel from one port to another:

Time = Distance / (Speed of the motorboat in still water + Speed of the current)

Time = 138.6 km / (13.3 km/h + 0.7 km/h)

Time = 138.6 km / 14 km/h

Time = 9.9 hours

Therefore, it would take approximately 9.9 hours for the motorboat to travel from one port to another.

2. Time required to return from the second port to the first port: - Distance: 138.6 km - Speed of the motorboat in still water: 13.3 km/h - Speed of the current: 0.7 km/h

Using the same formula, we can calculate the time required to return from the second port to the first port:

Time = Distance / (Speed of the motorboat in still water - Speed of the current)

Time = 138.6 km / (13.3 km/h - 0.7 km/h)

Time = 138.6 km / 12.6 km/h

Time = 11 hours

Therefore, it would take approximately 11 hours for the motorboat to return from the second port to the first port.

3. Total time required for the motorboat to travel from one port to another and return: - Time required to travel from one port to another: 9.9 hours - Time required to return from the second port to the first port: 11 hours

To calculate the total time required, we can add the time required to travel from one port to another and the time required to return:

Total Time = Time to travel from one port to another + Time to return from the second port to the first port

Total Time = 9.9 hours + 11 hours

Total Time = 20.9 hours

Therefore, it would take approximately 20.9 hours for the motorboat to travel from one port to another and return.

Please note that these calculations assume a constant speed and do not account for factors such as changes in weather conditions or variations in the speed of the current.