How long did it take Jason to drive nonstop on a trip...

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swerve: Legendary Member; Posts: 2539; Joined: Sun Oct 29, 2017 2:04 pmFollowed by: 6 members

by swerve » Sat Nov 04, 2017 7:19 am

How long did it take Jason to drive nonstop pn a trip from his home to Glendale?

(1) Glendale is 400 miles from jason's home.
(2) Jason's average speed for the trip was 50 miles per hour.

The OA is C.

I don't understand why that is the correct answer. Please, can any expert assist me with this DS question? Thanks.

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Source: Beat The GMAT — Data Sufficiency | Sat Nov 04, 2017 7:19 am

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by [email protected] » Thu Nov 09, 2017 11:27 am

Hi swerve,

We're asked for how long it took Jason to drive nonstop from his home to Glendale. This question is based on the Distance Formula (Distance = Rate x Time)

(1) Glendale is 400 miles from Jason's home.

Fact 1 gives us the distance, but we still need Jason's rate to determine the time it took him to travel that distance.
Fact 1 is INSUFFICIENT

2) Jason's average speed for the trip was 50 miles per hour.

Fact 2 gives us the rate, but we still need Jason's distance to determine the time it took him to travel that distance.
Fact 2 is INSUFFICIENT

Combined, we know the distance (400 miles) and the rate (50 miles/hour), so we can figure out the time to travel that distance (in this case, 8 hours)
Combined, SUFFICIENT

Final Answer: C

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

Contact Rich at [email protected]

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