Question

Мотоциклист за первые 2 ч проехал 90 км, а следующие 3 ч двигался со скоростью 50 км/ч. Какова средняя скорость мотоциклиста на всем.

Answer 1

U1=S1/t1=90/2=45 км/ч 
S2=50*3=150 км 
Sобщ=S1+S2=90+150=240 км 
tобщ=t1+t2=5 ч 
Uср=Sобщ/tобщ=240/5=48 км/ч

Answer 2

50*3=150
150+90=240
240:(3+2)=48

Answer 3

Calculating the Average Speed of the Motorcyclist

To calculate the average speed of the motorcyclist for the entire journey, we can use the formula:

Average Speed = Total Distance / Total Time

First, let's calculate the total distance covered by the motorcyclist.

The motorcyclist traveled at a speed of 90 km/h for the first 2 hours, covering a distance of 90 km. Then, the motorcyclist traveled at a speed of 50 km/h for the next 3 hours, covering a distance of 150 km. So, the total distance covered by the motorcyclist is 90 km + 150 km = 240 km.

Next, let's calculate the total time taken for the entire journey.

The motorcyclist traveled at 90 km/h for 2 hours and at 50 km/h for 3 hours, resulting in a total time of 2 hours + 3 hours = 5 hours.

Now, we can use the formula to find the average speed:

Average Speed = Total Distance / Total Time

Average Speed = 240 km / 5 hours = 48 km/h

Therefore, the average speed of the motorcyclist for the entire journey is 48 km/h.