Question

Две группы туристов отправились из села грибное в село ягодное в 10 утра.первая группа двигалась пешком по берегу реки со скоростью 4 км/ч,а вторая -вдоль берега на лодках со скоростью 14 км/ч.первая группа добралась до места к5 часам вечера.в какое время прибыла в село ягодное вторая группа туристов?

Answer 1

 с 10:00 до 17:00 - 7ч - время в пути первой группы
7*4=28 км расстояние между селами
28:14=2ч -время в пути второй группы
Ответ: вторая группа прибыла в село Ягодное через 2 ч, то есть в 12:00

Answer 2

Problem Analysis

Two groups of tourists are traveling from the village of Gribovo to the village of Yagodnoye. The first group is traveling on foot along the riverbank at a speed of 4 km/h, while the second group is traveling by boat along the same riverbank at a speed of 14 km/h. The first group arrives at their destination at 5:00 PM. We need to determine the time at which the second group arrives in the village of Yagodnoye.

Solution

To find the time at which the second group arrives in the village of Yagodnoye, we need to calculate the travel time for both groups and add it to the starting time of 10:00 AM.

Let's calculate the travel time for each group:

- The first group travels on foot at a speed of 4 km/h. They arrive at their destination at 5:00 PM, which means they have traveled for 7 hours (from 10:00 AM to 5:00 PM).

- The second group travels by boat at a speed of 14 km/h. Since they are traveling along the same riverbank, their travel distance is the same as the first group. Therefore, we can use the formula: time = distance / speed.

Let's calculate the travel time for the second group:

- The distance traveled by both groups is the same, but we don't have the exact distance. However, since both groups are traveling along the same riverbank, we can assume that the distance is the same for both groups.

- Since the first group travels at a speed of 4 km/h and takes 7 hours to reach their destination, we can calculate the distance using the formula: distance = speed * time. Therefore, the distance traveled by the first group is 4 km/h * 7 hours = 28 km.

- Now, we can calculate the travel time for the second group using the formula: time = distance / speed. Substituting the values, we get: time = 28 km / 14 km/h = 2 hours.

To find the arrival time for the second group, we add the travel time of 2 hours to the starting time of 10:00 AM:

- 10:00 AM + 2 hours = 12:00 PM.

Therefore, the second group of tourists arrives in the village of Yagodnoye at 12:00 PM.

Answer

The second group of tourists arrives in the village of Yagodnoye at 12:00 PM.