Answer: 10?
Step-by-step explanation:
I'm guessing the problem based off your description
5 (1/2) x 4 = X
2.5 x 4 = X
X = 10
Castel's average speed from the science museum to mountains is 20 km/h
<h3>A
verage speed</h3>
Let x represent Castel' average speed.
Sumalee left one hour later and caught up with Castel after two hours, Let us assume the distance covered is d:
For Castel:
For Sumalee:
- x + 10 = d / 2
- d = 2x + 20
3x = 2x + 20
x = 20 km/h
Therefore Castel's average speed from the science museum to mountains is 20 km/h
Find out more on average speed at: brainly.com/question/4931057
The closest marks on the ruler that was used to make a measurement of 23.435m is 0.01m apart.
<h3>What is a Ruler?</h3>
This refers to a tool which is used to measure distances of two points or area and has standard markings.
Since the thousandth digit is uncertain and the significant figures are digits which are read from the measuring instrument plus one doubtful number on the ruler then the most appropriate choice will be 0.01m.
Read more about Ruler here brainly.com/question/18558504
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