Question

It would take 38 minutes to fall through a (hypothetical) hole from one end of the Earth to the other. Until recently, it was thought to be 42 minutes. What is the percent change in the "hypothetical" time it takes

Answer 1

Answer:

The percentage change in the hypothetical time is 10.53%

Explanation:

Percentage change in a quantity is given by;

$\frac{Final quantity - Initial quantity}{Initial quantity}$ * 100%

In this case, the quantity in question is time.

Therefore, percentage change in time =

$\frac{Final time- Initial time}{Initial time}$ * 100%

where;

Final time = 42minutes

Initial time = 38minutes

Substituting these values into the equation above gives;

=> $\frac{42 - 38}{38}$ * 100%

=> $\frac{4}{38}$ * 100%

=> 10.53%

Hope this helps!