Question

2 всадника расстояние между которыми 140 км выехали навстречу друг другу причем один выехал через 3 часа после другого через сколько часов после отьезда первого они встретятся если первый проезжал 10 км в ч а 2 12 км в ч

Answer 1

1 всадник со скоростью 10 км/час ехал 3 часа и преодолел расстояние 12*3=30 км
140-30=110 км осталось между всадниками
12+10=22 км/ч скорость сближения всадников
110:22= 5 ч проедет 2 всадник, выехавший позже
3+5=8 ч до встречи будет в пути первый всадник

Answer 2

Problem Analysis

We are given that two riders start from different points and are traveling towards each other. The distance between them is 140 km. One rider starts 3 hours after the other. We are also given the speeds of the riders: one is traveling at 10 km/h and the other at 12 km/h. We need to determine how many hours after the departure of the first rider they will meet.

Solution

To solve this problem, we can use the formula: time = distance / speed. Let's calculate the time it takes for each rider to reach the meeting point.

The first rider travels at a speed of 10 km/h and starts 3 hours before the second rider. So, the time taken by the first rider to reach the meeting point can be calculated as: time1 = distance / speed1 = 140 km / 10 km/h = 14 hours.

The second rider travels at a speed of 12 km/h and starts 3 hours after the first rider. So, the time taken by the second rider to reach the meeting point can be calculated as: time2 = distance / speed2 = 140 km / 12 km/h = 11.67 hours.

Since the second rider starts 3 hours after the first rider, we need to add this time difference to the time taken by the second rider to get the total time after the departure of the first rider: total time = time2 + 3 hours = 11.67 hours + 3 hours = 14.67 hours.

Therefore, the two riders will meet approximately 14.67 hours after the departure of the first rider.

Answer

The two riders will meet approximately 14.67 hours after the departure of the first rider.