Question

Два лыжника ехали на встречу друг другу. 1 лыж. - 4,2 км в час. 2 лыж. - 3,4 км в час. t= 2 ч . d2= 19 км. Как найти S и време встречи ?

Answer 1

12*3=36 км прошел за 3 часа 1 лыжник                                                                    66-36=30 км за 3 часа прошел 2 лыжник                                                                  30:3=10 км/час скорость 2 лыжника                                                                           Ответ: 2 лыжник ехал со скоростью 10 км/час

Answer 2

Problem Analysis

We are given the following information: - The first skier travels at a speed of 4.2 km/h. - The second skier travels at a speed of 3.4 km/h. - The total time of travel is 2 hours. - The distance covered by the second skier is 19 km.

We need to find the distance covered by the first skier and the time of their meeting.

Finding the Distance Covered by the First Skier

To find the distance covered by the first skier, we can use the formula: distance = speed × time.

Let's denote the distance covered by the first skier as d1.

Using the given information, we have: - Speed of the first skier = 4.2 km/h - Time = 2 hours

Substituting these values into the formula, we get: d1 = (speed of the first skier) × (time) = 4.2 km/h × 2 hours = 8.4 km. Therefore, the distance covered by the first skier is 8.4 km.

Finding the Time of their Meeting

To find the time of their meeting, we can use the formula: time = distance / relative speed.

Let's denote the time of their meeting as t.

Using the given information, we have: - Distance covered by the second skier = 19 km - Relative speed = (speed of the first skier) + (speed of the second skier)

Substituting these values into the formula, we get: t = (distance covered by the second skier) / (relative speed) = 19 km / (4.2 km/h + 3.4 km/h) = 19 km / 7.6 km/h ≈ 2.5 hours. Therefore, the time of their meeting is approximately 2.5 hours.

Summary

Based on the given information, we have determined the following: - The distance covered by the first skier is 8.4 km. - The time of their meeting is approximately 2.5 hours.

Please let me know if there is anything else I can help you with!