Question

Расстояние между пристанями M и N 162км.От пристани М отошел теплоход со скоростью 45 км/ч.Через 45 мин от пристани N навстречу ему отошел другой теплоход, скорость которого 36 км/ч.Через сколько часов после отправления первого теплохода они встретятся?

Answer 1

х время в пути 1 теплохода
х-0,75 часа время в пути 2 теплохода
 45х+36(х-0,75)=162
45х+36х-27=162
81х-27=162
81х=189
х=189:81
х= 7/3 = 2 1/3 часа

не уверена но помоему так

если че поставь лучший)))плизик)*

 

 

 

 

Answer 2

45/4*3=33,75км-прошел первый теплоход за 45 минут

162-33,75=128,25км-расстояние между теплоходами на момент выхода второго

45+36=81км/ч-скорость сближения

128,25/81=1,58часа с момента выхода второго теплохода

1,58+0,75=2,33часа=2ч20мин до встречи

 

Answer 3

Problem Analysis

We are given the distance between two ports, M and N, which is 162 km. A boat departs from port M with a speed of 45 km/h. After 45 minutes, another boat departs from port N towards the first boat with a speed of 36 km/h. We need to determine how many hours after the departure of the first boat the two boats will meet.

Solution

To solve this problem, we can use the formula:

Time = Distance / Speed

Let's calculate the time it takes for the first boat to reach the meeting point.

The distance covered by the first boat in 45 minutes can be calculated as follows:

Distance covered by the first boat = Speed of the first boat * Time

Since the time is given in minutes, we need to convert it to hours by dividing it by 60:

Time = 45 minutes / 60 = 0.75 hours

Substituting the values into the formula, we have:

Distance covered by the first boat = 45 km/h * 0.75 hours = 33.75 km

Now, let's calculate the remaining distance between the two boats:

Remaining distance = Total distance - Distance covered by the first boat

Remaining distance = 162 km - 33.75 km = 128.25 km

Next, we need to calculate the time it takes for the second boat to cover the remaining distance. We can use the same formula:

Time = Distance / Speed

Substituting the values, we have:

Time = 128.25 km / 36 km/h = 3.5625 hours

Therefore, the two boats will meet approximately 3.5625 hours after the departure of the first boat.

Answer

The two boats will meet approximately 3.5625 hours after the departure of the first boat.