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

Redeem

Edwin is planning to drive from Boston to New Orleans. By what percent would his travel time be reduced if Edwin decides

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Moderator
Posts: 7187
Joined: Thu Sep 07, 2017 4:43 pm
Followed by:23 members

Edwin is planning to drive from Boston to New Orleans. By what percent would his travel time be reduced if Edwin decides

by BTGmoderatorDC » Wed Mar 02, 2022 4:46 pm

Timer

00:00

Your Answer

A

B

C

D

E

Global Stats

Edwin is planning to drive from Boston to New Orleans. By what percent would his travel time be reduced if Edwin decides to split the driving time equally with his friend George, instead of making the trip alone?

(1) The driving distance from Boston to New Orleans is 1500 miles.
(2) George’s driving speed is 1.5 times Edwin’s driving speed.


OA B

Source: Manhattan Prep
Top
Source: — Data Sufficiency |
Legendary Member
Posts: 2499
Joined: Sun Oct 29, 2017 2:04 pm
Followed by:6 members

Re: Edwin is planning to drive from Boston to New Orleans. By what percent would his travel time be reduced if Edwin dec

by swerve » Sun Mar 06, 2022 6:10 am

Timer

00:00

Your Answer

A

B

C

D

E

Global Stats

BTGmoderatorDC wrote: ↑
Wed Mar 02, 2022 4:46 pm
 Edwin is planning to drive from Boston to New Orleans. By what percent would his travel time be reduced if Edwin decides to split the driving time equally with his friend George, instead of making the trip alone?

(1) The driving distance from Boston to New Orleans is 1500 miles.
(2) George’s driving speed is 1.5 times Edwin’s driving speed.


OA B

Source: Manhattan Prep
Wanted \(\dfrac{T_{old} - T_{new}}{T_{old}} = ?\)

1) \(D = 1500\). Not sufficient \(\Large{\color{red}\chi}\)

2) Use formula: \(R1T1 + R2T2 = W\)
\(T2 = T1\) (Given: "split the driving time equally")
\(R1 = S\)
\(R2 = 1.5S\)
\(ST1 + 1.5ST1 = D\)
\(T1 (2.5S) = D\)
\(T1 = \dfrac{D}{2.5S}\)

So,
\(T_{new} = T1 + T2 = 2\cdot T1 = \dfrac{2D}{2.5S}\)

Now we have both \(T_{new}\) and \(T_{old}\) so we can stop here. Sufficient \(\Large{\color{green}\checkmark}\)

Therefore, B
Top
Post new topic Post Reply
• Page 1 of 1