Question

Байдарка 5 ч шла со скоростью 4 км/ч, а остальное время со скоростью 6 км / ч . сколько часов она была в пути , если всего прошла 38 км.?

Answer 1

38-(5*4):6+5=8(км)
Ответ:8км

Answer 2

Объяснеие: Для начала умножаем 5ч*4км/ч=20км этим мы узнаем, сколько прошла байдарка за 5часов. 
1) 38-20=18(км) -прошла байдарка в остальное время  
2) 18/6=3(ч) -остальное время 
3) 5+3=8(ч) -она была в пути 
Ответ: 8 ч

Answer 3

Calculation of Time Taken by the Kayak

To calculate the time taken by the kayak, we need to determine the time taken at each speed and then add them together.

Let's assume that the kayak traveled at a speed of 4 km/h for a certain amount of time and then at a speed of 6 km/h for the remaining time.

Let's denote: - t1 as the time taken at a speed of 4 km/h - t2 as the time taken at a speed of 6 km/h

We know that the total distance traveled by the kayak is 38 km.

Using the formula distance = speed × time, we can set up the following equations:

1. For the time taken at a speed of 4 km/h: - distance = speed × time - 38 km = 4 km/h × t1

2. For the time taken at a speed of 6 km/h: - distance = speed × time - 38 km = 6 km/h × t2

To solve these equations, we can rearrange them to solve for t1 and t2:

1. For t1: - t1 = 38 km / 4 km/h - t1 = 9.5 hours

2. For t2: - t2 = 38 km / 6 km/h - t2 = 6.33 hours

Now, we can add the times together to find the total time taken by the kayak:

- Total time = t1 + t2 - Total time = 9.5 hours + 6.33 hours - Total time = 15.83 hours

Therefore, the kayak was in motion for approximately 15.83 hours to cover a total distance of 38 km.

Please note that these calculations assume a constant speed throughout the journey and do not account for factors such as rest breaks or changes in speed during the trip.