Question

Помогите решить задачи. 1) Из одной норки одновременно в противоположных направлениях подбежали две ящерицы. На каком расстояние друг от друга будут ящерицы через 4 мин. 12сек, если первая бежала со скоростью 7м/с, а вторая -- на 1 м/с медленнее. 2)За два блокнота , 5 карандашей и 3 ручки заплатили 119 руб. Найди цену блокнота, карандаша и ручки, если за 2 блокнота и 5 карандашей заплатили 83 рубля, а за 5 карандашей и 3 ручки - 81 рубль

Answer 1

Problem 1: Distance between two lizards

To find the distance between two lizards, we need to determine the distance each lizard covers in 4 minutes and 12 seconds. The first lizard runs at a speed of 7 m/s, while the second lizard runs 1 m/s slower.

To calculate the distance covered by each lizard, we can use the formula:

Distance = Speed × Time

For the first lizard: Distance covered by the first lizard = 7 m/s × (4 minutes + 12 seconds)

For the second lizard: Distance covered by the second lizard = (7 m/s - 1 m/s) × (4 minutes + 12 seconds)

Let's calculate the distances covered by each lizard.

Solution to Problem 1:

First, let's convert 4 minutes and 12 seconds to seconds:

4 minutes = 4 × 60 seconds = 240 seconds 12 seconds = 12 seconds

Now, we can calculate the distances covered by each lizard:

Distance covered by the first lizard = 7 m/s × (240 seconds + 12 seconds) = 7 m/s × 252 seconds = 1764 meters

Distance covered by the second lizard = (7 m/s - 1 m/s) × (240 seconds + 12 seconds) = 6 m/s × 252 seconds = 1512 meters

Therefore, the two lizards will be 1512 meters apart after 4 minutes and 12 seconds.