Question

Нерешительный ослик иа-иа переходит реку по мосту длиной 150 метров каждые 5 минут он проходит вперёд 20 метров а за следующие 5 минут возвращают на10 метров.За какое время он перейдёт реку?

Answer 1

Значит, за 10 минут он проходит 10 м
150-------х
10-------10
150*10/10=150 мин.=2,5 часа

Answer 2

Problem Analysis

The donkey crosses a 150-meter long bridge in a pattern where it moves forward 20 meters every 5 minutes and then returns 10 meters in the next 5 minutes. We need to calculate the total time it takes for the donkey to cross the bridge.

Solution

To solve this problem, we can calculate the number of 5-minute intervals required for the donkey to cross the bridge. We'll then convert this number into minutes to find the total time taken.

Let's calculate the number of intervals required for the donkey to cross the bridge: 1. The donkey moves forward 20 meters every 5 minutes. 2. It returns 10 meters in the next 5 minutes.

This means the donkey covers a net distance of 10 meters every 5 minutes.

Calculation

The total distance to be covered is 150 meters. Therefore, the number of 5-minute intervals required can be calculated as follows: - 150 meters / 10 meters per 5 minutes = 15 intervals

Total Time Taken

The total time taken can be calculated as follows: - 15 intervals * 5 minutes per interval = 75 minutes

Therefore, the donkey will take 75 minutes to cross the bridge.