A car traveled 139.2km in 3.8 hours. what was the average speed?

Explanation:

The average speed of the car can be found by using the formula

d is the distance

t is the time taken

From the question we have

We have the final answer as

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b.a device that inputs heat into a cool object

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.