Answer :
At 100 km/hr, it would take approximately 28.65 hours, or rounded to 28.9 hours, to travel through the Earth's mantle, hence the correct answer is C. 28.9 hours.
The question asks for the time it would take to travel through the Earth's mantle at a speed of 100 km/hr. This is a mathematical calculation involving distance and speed.
To answer this, we need to know the thickness of the Earth's mantle. The mantle extends from about 35 km below the surface to about 2,900 km below the surface, which gives us a thickness of approximately 2,865 km.
Using the formula
time = distance / speed,
we calculate the time as follows:
Time = 2,865 km / 100 km/hr
= 28.65 hours
So, at a speed of 100 km/hr, it would take approximately 28.65 hours to travel through the mantle. This answer rounds to 28.9 hours, which corresponds to option C.
