Question

Лодка плывет по реке. Собственная скорость лодки составляет v км/ч, а скорость течения реки – 6 км/ч. Тогда лодка за 2,5 ч по течению реки проплывет_____ км, а за t ч против течения реки_____ км. Если известно, что скорость лодки v = 35 км/ч, то против течения реки она проплывет_____км.​

Answer 1

Ответ:

Тогда лодка за 2,5 ч по течению реки проплывет (v+6)*2,5 км.

а за t ч против течения реки (v-6)*t км.

Пошаговое объяснение:

(v-6)*t;. при v=35km/ч

(v-6)*t=(35-6)*t=29*t=29t км/ч

Answer 2

Calculation of Distance Traveled

To calculate the distance traveled by the boat, we need to consider the boat's speed and the speed of the river current. Let's break down the problem step by step.

Given: - Boat's speed: v km/h - River current speed: 6 km/h - Time taken to travel downstream (with the current): 2.5 hours - Time taken to travel upstream (against the current): t hours

To find the distance traveled downstream, we can use the formula:

Distance = Speed × Time

The boat's speed relative to the river current when traveling downstream is the sum of the boat's speed and the river current speed:

Speed downstream = v + 6 km/h

Substituting the values into the formula, we get:

Distance downstream = (v + 6) × 2.5 km

To find the distance traveled upstream, we need to subtract the speed of the river current from the boat's speed:

Speed upstream = v - 6 km/h

Substituting the values into the formula, we get:

Distance upstream = (v - 6) × t km

Now, let's calculate the distances.

For the given time of 2.5 hours downstream: - Speed downstream = v + 6 km/h - Distance downstream = (v + 6) × 2.5 km

For the given time of t hours upstream: - Speed upstream = v - 6 km/h - Distance upstream = (v - 6) × t km

To find the distance traveled when the boat's speed is 35 km/h upstream, we can substitute v = 35 km/h into the formula for distance upstream:

Distance upstream = (35 - 6) × t km

Now, let's calculate the distances using the given values.

Calculation:

Given: - Boat's speed (v) = 35 km/h - River current speed = 6 km/h - Time taken downstream = 2.5 hours - Time taken upstream = t hours

Distance downstream = (v + 6) × 2.5 km Distance upstream = (v - 6) × t km

Substituting the values: - Distance downstream = (35 + 6) × 2.5 km = 41 × 2.5 km = 102.5 km - Distance upstream = (35 - 6) × t km = 29 × t km

Therefore, the boat will travel 102.5 km downstream in 2.5 hours and 29t km upstream.

Please note that the distance traveled upstream depends on the value of t, which is not provided in the question.