Question

Два дельфина поплыли друк другу навстречу, когда между ними было 4 км. скорость одного дельфина 400м/мин, а другого- на 15м/мин меньше. какое расстояние будет между дельфинами через 5 мин.? помогите очень надо

Answer 1

1) 400-15=385 - скорость второго дельфина
2) 400х5=2000м проплывет 1 дельфин за 5 минут
3) 385х5=1925м проплывет 2 дельфин за 5 минут
4) 4000(4км)-2000-1925=75м останется между дельфинами через 5минут

Answer 2

Problem Analysis

We are given that two dolphins are swimming towards each other, with a distance of 4 km between them. The speed of one dolphin is 400 m/min, while the speed of the other dolphin is 15 m/min slower. We need to find the distance between the dolphins after 5 minutes.

Calculation

To find the distance between the dolphins after 5 minutes, we need to calculate the distance covered by each dolphin in 5 minutes and subtract it from the initial distance of 4 km.

Let's calculate the distance covered by the first dolphin in 5 minutes: - Speed of the first dolphin = 400 m/min - Time = 5 minutes - Distance covered by the first dolphin = Speed * Time = 400 m/min * 5 min = 2000 meters

Now, let's calculate the distance covered by the second dolphin in 5 minutes: - Speed of the second dolphin = Speed of the first dolphin - 15 m/min = 400 m/min - 15 m/min = 385 m/min - Time = 5 minutes - Distance covered by the second dolphin = Speed * Time = 385 m/min * 5 min = 1925 meters

Finally, let's calculate the distance between the dolphins after 5 minutes: - Initial distance = 4 km = 4000 meters - Distance covered by the first dolphin = 2000 meters - Distance covered by the second dolphin = 1925 meters - Distance between the dolphins after 5 minutes = Initial distance - Distance covered by the first dolphin - Distance covered by the second dolphin = 4000 meters - 2000 meters - 1925 meters = 75 meters

Answer

The distance between the dolphins after 5 minutes will be 75 meters.