Atrain travels 120 km at a speed of 60 km/h, makes a stop for 0.5 h, and then travels the next 180 km at a speed of 90 km/h. what is the average speed of the train for this trip?

The average speed of the train for the trip is equal to

Why?

To calculate the average speed, we need to divide the trip into three moments:

- First moment, the train traveled 120 km at a speed of 60 km/h.

- Second moment, the train stopped for 0.5 hours, meaning that the train did not travel for that time (traveled distance equal to 0 km).

- Third moment, the train traveled 180 km at a speed of 90 km/h.

We can use the following formula to calculate the average speed:

So, for our problem we have:

From the statement, we know that:

Calculating the times, we have:

Then, substituting the times into the main equation, we have:

Hence, we have that the average speed of the train for the trip is equal to

Have a nice day!

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.

answer: (431,2)

step-by-step explanation: