Answer:
Please refer to the attachment
Take the 2 times you are given and add them to x and divide the entire left side of the equation by 3:
54.3+56.1+x/3=55
54.3+56.1+x=165
x=54.6
The 3rd lap took him 54.6 seconds to run
Answer:
What is the car's rate in kilometers per minute?

How many kilometers will the car travel in 5 minutes?

Step-by-step explanation:
If we know:

And there are 60 minutes in an hour:

We can do:

From here, we figure out the distance from minutes:

Answer: 8mph
Step-by-step explanation:
If Marco bicycles 20 miles in 2.5 hours. divide 20 by 2.5 to get the average rate.
20/2.5 = 8
(Don't forget to add units)
8mph
Answer: 150
Step-by-step explanation:
20 is 1/3 of 60. So you can just multiply 50x3 so the answer becomes 150.