Hi Stardust Chris,

The 'key' to this DS question is to spot the hidden ratio when it occurs....

We're told that Paul jogs at a constant rate for 80 minutes. The question asks how FAR Paul jogs in that time.

Fact 1: Paul began jogging at 5pm.

Paul's start time tells us nothing about the distance he traveled (although we could figure out when he finished running - 5:00pm + 80 minutes = 6:20pm).

Fact 1 is INSUFFICIENT

Fact 2: Paul had jogged 5 miles by 5:40 P.M. and 8 miles by 6:04 P.M

Here, we actually have specific information about HOW FAR Paul traveled during a certain period of time...

5 miles by 5:40pm

8 miles by 6:04pm

This means that Paul jogged 3 miles in 24 minutes. Since Paul is jogging at a CONSTANT speed, we can now figure out how far he traveled over ANY period of time....

3 miles in 24 minutes =

1 mile in 8 minutes.

Seeing this ratio, we CAN answer the question. While you don't need to do the extra work at this point, you could....

1 mile/8 minutes = X miles/80 minutes

X = 10 miles

Fact 2 is SUFFICIENT

Final Answer:

GMAT assassins aren't born, they're made,

Rich

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