Question

Помогите решить задачу от села до города 120 км в 8 ч утра из села в город выехал мотоциклист. В пути он сделал две десяти минутные остановки в 10 ч 20 мин он был в городе. Какова скорость мотоциклиста

Answer 1

10+10=20 (мин) все остановки 
10ч-8ч=2 часа - он был в пути
120:2=60
Ответ : 60 км/ч

Answer 2

Problem Analysis

To solve this problem, we need to find the speed of the motorcyclist. We are given that the distance from the village to the city is 120 km and the motorcyclist traveled this distance in 8 hours, including two 10-minute stops. We also know that the motorcyclist arrived in the city at 10:20 AM.

Calculating Speed

To calculate the speed of the motorcyclist, we can use the formula:

Speed = Distance / Time

The distance is given as 120 km, and the time is the total travel time minus the time spent on stops. Let's calculate the time spent on stops first.

Calculating Time Spent on Stops

We are given that the motorcyclist made two 10-minute stops. Therefore, the total time spent on stops is:

Total Time Spent on Stops = 2 stops * 10 minutes per stop = 20 minutes

Now, let's calculate the total travel time.

Calculating Total Travel Time

The motorcyclist started at 8:00 AM and arrived in the city at 10:20 AM. To calculate the total travel time, we need to find the time difference between these two times.

Total Travel Time = Arrival Time - Departure Time

The departure time is 8:00 AM, and the arrival time is 10:20 AM. Let's convert these times to minutes for easier calculation.

Departure Time = 8:00 AM = 8 * 60 minutes = 480 minutes

Arrival Time = 10:20 AM = 10 * 60 minutes + 20 minutes = 620 minutes

Now, we can calculate the total travel time:

Total Travel Time = 620 minutes - 480 minutes = 140 minutes

However, we need to subtract the time spent on stops from the total travel time to get the actual travel time.

Actual Travel Time = Total Travel Time - Total Time Spent on Stops

Actual Travel Time = 140 minutes - 20 minutes = 120 minutes

Now that we have the actual travel time, we can calculate the speed.

Calculating Speed

We can use the formula:

Speed = Distance / Time

Substituting the values:

Speed = 120 km / 120 minutes

Simplifying:

Speed = 1 km/minute

Therefore, the speed of the motorcyclist is 1 km/minute.

Note: The speed is given in km/minute because the time was calculated in minutes.