Question

первый километр дистанции пловец проплыл за 20 мин,а второй километр-за 40 мин.во сколько раз увеличилось время,затраченное пловцом на втором километре, по сравнению со временем,затраченным на первом километре дистанции?во сколько раз уменьшелась скорость пловца на втором киломере по сравнению со скоростью на первом километре дистанции?

Answer 1

40:20=2 раза - увеличилось время на втором км

Так расстояние на 1 и 2 км дистанции одинаково, а время на 2 ушло в 2 раза больше, значит скорость на 2 дистанции уменьшилась так же в 2 раза.

Answer 2

Calculation of Time and Speed

To calculate the increase in time and decrease in speed for the second kilometer compared to the first kilometer, we need to consider the time taken for each kilometer and the speed of the swimmer.

Let's denote the time taken for the first kilometer as t1 and the time taken for the second kilometer as t2.

Given that the swimmer took 20 minutes to swim the first kilometer and 40 minutes to swim the second kilometer, we have:

- t1 = 20 minutes - t2 = 40 minutes

To calculate the increase in time, we can divide the time taken for the second kilometer by the time taken for the first kilometer:

Increase in time = t2 / t1

To calculate the decrease in speed, we can divide the time taken for the first kilometer by the time taken for the second kilometer:

Decrease in speed = t1 / t2

Let's calculate these values:

Increase in time = 40 minutes / 20 minutes = 2

Decrease in speed = 20 minutes / 40 minutes = 0.5

Therefore, the time taken by the swimmer for the second kilometer increased by a factor of 2 compared to the first kilometer, and the speed of the swimmer on the second kilometer decreased by a factor of 0.5 compared to the first kilometer.

Please let me know if you need any further clarification.