Question

Мальчик за 25 минут прошёл 1,2 км , затем полчаса отдыхал , а затем пробежал ещё 800м за 5 мин .Какова была его средняя скорость

Answer 1

25 +5 =30 минут
1.200+ 800 = 2 км
2 км в 30 минут
4 км в 1 час

Answer 2

1) 1.2 км=1200м
2)25+30+5=60мин
3)1200:60=20м/мин

Answer 3

Calculation of Average Speed

To calculate the average speed of the boy, we need to determine the total distance he covered and the total time it took him. Let's break down the information given:

- The boy walked 1.2 km in 25 minutes. - He rested for 30 minutes. - He then ran an additional 800 meters in 5 minutes.

To calculate the average speed, we need to convert the time to hours and the distance to kilometers.

1. Convert the time: - The boy walked for 25 minutes and ran for 5 minutes, totaling 30 minutes. - 30 minutes is equal to 0.5 hours.

2. Convert the distance: - The boy walked 1.2 km and ran an additional 0.8 km, totaling 2 km.

Now, we can calculate the average speed using the formula:

Average Speed = Total Distance / Total Time

Average Speed = 2 km / 0.5 hours

Average Speed = 4 km/h

Therefore, the boy's average speed was 4 km/h.