Question

От пристани отошёл теплоход со скоростью 16км/ч.Через 3 ч вслед ему отошёл другой теплоход и через 12 ч догнал первый.С какой скоростью двигался второй теплоход? Помогите решить!!!!!!!

Answer 1

12+3=15 часов плыл 1 теплоход                                                                       16*15=240 км проплыл за 15 часов 1 теплоход                                                  240:12=20 км/час скорость 2 теплохода                                                           Ответ: 2 теплоход шел со скоростью 20 км/час

Answer 2

Problem Analysis

We are given that a boat departs from a dock with a speed of 16 km/h. After 3 hours, another boat departs from the same dock and catches up to the first boat after 12 hours. We need to find the speed of the second boat.

Solution

Let's assume the speed of the second boat is x km/h.

The first boat travels for 3 hours at a speed of 16 km/h, so the distance it covers is: Distance1 = Speed1 * Time1 = 16 km/h * 3 h = 48 km.

The second boat travels for 12 hours at a speed of x km/h, so the distance it covers is: Distance2 = Speed2 * Time2 = x km/h * 12 h = 12x km.

Since the second boat catches up to the first boat, the distances covered by both boats are equal: Distance1 = Distance2.

Substituting the values, we have: 48 km = 12x km.

Simplifying the equation, we find: x = 48 km / 12 h = 4 km/h.

Therefore, the second boat was moving at a speed of 4 km/h.

Answer

The second boat was moving at a speed of 4 km/h.