BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Al and Barb shared the driving on a certain trip. What

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Moderator
Posts: 2505
Joined: Sun Oct 15, 2017 1:50 pm
Followed by:6 members

Al and Barb shared the driving on a certain trip. What

by BTGmoderatorLU » Tue Apr 09, 2019 2:46 pm

Timer

00:00

Your Answer

A

B

C

D

E

Global Stats

Source: Manhattan Prep

Al and Barb shared the driving on a certain trip. What fraction of the total distance did Al drive?

1) Al drove for \(3/4\) as much time as Barb did.
2) Al's average driving speed for the entire trip was \(4/5\) of Barb's average driving speed for the trip.

The OA is C
Top
Source: — Data Sufficiency |

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3008
Joined: Mon Aug 22, 2016 6:19 am
Location: Grand Central / New York
Thanked: 470 times
Followed by:34 members

by Jay@ManhattanReview » Tue Apr 09, 2019 10:31 pm

Timer

00:00

Your Answer

A

B

C

D

E

Global Stats

BTGmoderatorLU wrote:Source: Manhattan Prep

Al and Barb shared the driving on a certain trip. What fraction of the total distance did Al drive?

1) Al drove for \(3/4\) as much time as Barb did.
2) Al's average driving speed for the entire trip was \(4/5\) of Barb's average driving speed for the trip.

The OA is C
Say the total distance of the trip is D miles and AL drove d miles out of D miles. We have to get the value of d/D.

Let's take each statement one by one.

1) Al drove for \(3/4\) as much time as Barb did.

No information about the distance. Note that we cannot assume that Aland Barb drove at the same average driving speed for the trip. Insufficient.

2) Al's average driving speed for the entire trip was \(4/5\) of Barb's average driving speed for the trip.

We do not know for how long Al and Barb drove. Insufficient.

(1) and (2) together

From (1), say Al's driving time = 3 hours; thus, Barb's driving time = 4 hours
From (2), say Al's average speed = 40 mph; thus, Barb's average speed = 50 mph

Thus, the distance drove by Al = d = 40*3 = 120 miles and the distance drove by Barb = 50*4 = 200 miles. Thus, D = 120 + 200 = 320 miles

Thus, d/D = 120/200. Sufficient.

The correct answer: C

Hope this helps!

-Jay
_________________
Manhattan Review GMAT Prep

Locations: Geneva GMAT Prep | Free TOEFL Practice Questions | LSAT Prep Courses Toronto | SAT Prep Courses Hong Kong | and many more...

Schedule your free consultation with an experienced GMAT Prep Advisor! Click here.
Top
Post new topic Post Reply
• Page 1 of 1