Question

Двигаясь против течения реки, теплоход за 3 ч прошел 63 км. Какова скорость течения реки, если собственная скорость теплохода - 23км/ч?

Answer 1

23*3=69
69-63=6
6/3=2 км/ч скорость течения

Answer 2

Скорость теплохода против течения реки  63 км/3 ч= 21 км/чсобственная скорость теплохода — 23 км/чскорость течения реки   23-21 = 2 км/ч

Answer 3

Problem Analysis

To solve this problem, we can use the formula: distance = speed × time. The speed of the boat relative to the water is the sum of the speed of the boat in still water and the speed of the current.

Given: - Time taken = 3 hours - Distance traveled against the current = 63 km - Speed of the boat in still water = 23 km/h

We need to find the speed of the current.

Calculation

Let's denote: - Speed of the current as c (in km/h)

The boat's speed against the current can be calculated using the formula: speed against the current = speed in still water - speed of the current

Given that the boat traveled 63 km against the current in 3 hours, we can use the formula to find the speed of the current.

Solution

Using the given information and the formula, we can calculate the speed of the current as follows:

speed against the current = 23 - c distance = speed × time 63 = (23 - c) × 3 63 = 69 - 3c 3c = 69 - 63 3c = 6 c = 2

Answer

The speed of the current is 2 km/h.