Question

Из пункта А в пункт Б отправили плот вниз по реке одновременно с ним из пункта Б в пункт а вышел катер который прибыл в пункт А через 5 часов. через сколько часов катер встретив плот Если плод прибыл в пункт Б через 20 часов после начала движения?

Answer 1

1 - расстояние от А до Б (или обратно)
1/5 - скорость катера
1/20 - скорость плота
1/5+1/20=4/20+1/20=5/20=1/4 - скорость сближения
1:1/4=4 (ч)
Ответ: катер встретил плот через 4 часа

Answer 2

Problem Analysis

To solve this problem, we need to determine the time it takes for the boat to meet the raft. We are given that the raft takes 20 hours to travel from point A to point B, and the boat takes 5 hours to travel from point B to point A. We also know that they started at the same time.

Solution

Let's calculate the time it takes for the boat to meet the raft.

The time it takes for the boat to meet the raft can be calculated using the concept of relative speed. The relative speed of the boat and the raft is the sum of their individual speeds when moving towards each other.

The formula to calculate the time it takes for the boat to meet the raft is: Time = Distance / Relative Speed

Calculation

1. The raft takes 20 hours to travel from point A to point B. 2. The boat takes 5 hours to travel from point B to point A.

Using the formula: Time = Distance / Relative Speed

We can calculate the time it takes for the boat to meet the raft.

Result

The boat will meet the raft after 4 hours.

This calculation is based on the relative speed concept and the given travel times of the boat and the raft.

[[3 #]]