Question

Два часа лыжник шел со скоростью 18 км ч потом 30 мин со скоростью 16 км ч и еще 30 мин со скоростью 12 км ч.с какой скоростью ему нужно двигаться чтобы пройти это расстояние за 2 часа

Answer 1

Со скоростью 32 км/ч

Answer 2

Calculation of Average Speed

To find the average speed at which the skier needs to travel in order to cover the given distance in 2 hours, we can use the formula:

Average Speed = Total Distance / Total Time

Let's calculate the total distance and total time first.

Given information: - The skier traveled for 2 hours in total. - The skier traveled at a speed of 18 km/h for 2 hours. - The skier traveled at a speed of 16 km/h for 30 minutes (0.5 hours). - The skier traveled at a speed of 12 km/h for 30 minutes (0.5 hours).

To calculate the total distance, we need to sum up the distances traveled at each speed.

Distance traveled at 18 km/h: 18 km/h * 2 hours = 36 km.

Distance traveled at 16 km/h: 16 km/h * 0.5 hours = 8 km.

Distance traveled at 12 km/h: 12 km/h * 0.5 hours = 6 km.

Total distance: 36 km + 8 km + 6 km = 50 km.

To calculate the total time, we need to sum up the times traveled at each speed.

Total time: 2 hours + 0.5 hours + 0.5 hours = 3 hours.

Now, we can calculate the average speed:

Average Speed = Total Distance / Total Time = 50 km / 3 hours = 16.67 km/h.

Therefore, the skier needs to travel at an average speed of 16.67 km/h in order to cover the given distance in 2 hours.