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Bob wants to run a mile in the same time as his sister.

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Bob wants to run a mile in the same time as his sister.

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Bob wants to run a mile in the same time as his sister. If Bob’s time for a mile is currently 10 minutes 40 seconds and his sister’s time is currently 9 minutes 36 seconds, by what percent does Bob need to improve his time in order run a mile in the same time as his sister?

(A) 3%
(B) 5%
(C) 8%
(D) 10%
(E) 12%

The OA is the option D.

What is the equation that I should use here to solve this PS question? I need some help experts. I ask for your help.

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Hello Vincen.

Let's take a look at your question.

First of all, let's convert the time to seconds.

Bob's time = 640 secs.
His sister's time = 576 secs.

Now, if we improve the time of Bob by 10% we can get that the new time is: 640 - 64 = 576 secs.

So, the correct answer is the option D=10%.

I hope this explanation may help you.

I'm available if you'd like a follow-up.

Regards.

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