Question

Теплоход по течению реки за 3 часа проплыл 87 км.Какой путь проплывет теплоход за 3,2 часа против течения реки,если скорость течения реки 3,5 км/ч

Answer 1

3,2*3,5=32/35
ответ 32/35
оралаоаралалалда

Answer 2

Calculation of the Distance Traveled by the Boat

To calculate the distance traveled by the boat against the current of the river, we can use the formula:

Distance = Speed x Time

Given that the boat traveled 87 km in 3 hours with the current, we can calculate the speed of the boat as:

Speed = Distance / Time

Substituting the given values, we have:

Speed = 87 km / 3 hours

Calculating this, we find that the speed of the boat with the current is approximately 29 km/h.

Now, to calculate the distance traveled by the boat against the current in 3.2 hours, we can use the formula:

Distance = Speed x Time

However, since the boat is now traveling against the current, we need to subtract the speed of the current from the speed of the boat. Given that the speed of the current is 3.5 km/h, the effective speed of the boat against the current is:

Effective Speed = Boat Speed - Current Speed

Substituting the given values, we have:

Effective Speed = 29 km/h - 3.5 km/h

Calculating this, we find that the effective speed of the boat against the current is approximately 25.5 km/h.

Now, we can calculate the distance traveled by the boat against the current in 3.2 hours using the effective speed:

Distance = Effective Speed x Time

Substituting the given values, we have:

Distance = 25.5 km/h x 3.2 hours

Calculating this, we find that the boat will travel approximately 81.6 km against the current in 3.2 hours.

Therefore, the boat will travel approximately 81.6 km against the current of the river in 3.2 hours.