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

Redeem

average speed

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 324
Joined: Thu Dec 24, 2009 6:29 am
Thanked: 17 times
Followed by:1 members

average speed

by rahul.s » Tue Feb 02, 2010 12:49 am
Jane walked for 4 miles. What was her average speed for the first 2 miles?

(1) Jane's average speed for the 4 miles was 3.2 miles per hour.

(2) It took Jane 15 minutes longer to walk the second 2 miles than it took her to walk the first 2 miles.

OA: C
Top
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 1275
Joined: Thu Sep 21, 2006 11:13 pm
Location: Arabian Sea
Thanked: 125 times
Followed by:2 members

by ajith » Tue Feb 02, 2010 12:58 am
rahul.s wrote:Jane walked for 4 miles. What was her average speed for the first 2 miles?

(1) Jane's average speed for the 4 miles was 3.2 miles per hour.

(2) It took Jane 15 minutes longer to walk the second 2 miles than it took her to walk the first 2 miles.

OA: C
1) Insuff (it doesnt give the avg speed for first 2 miles)
2) Insuff ( it doesnt help us quantify how much slower Jane was in the second half)

Combining 1&2

Time jane took for walking 4 miles = 4/3.2 = 1.25 hours = 75 minutes
say jane took x minutes to walk first 2 miles, (2) gives us x+x+15 =75

x= 30 minues

average speed for first two miles = distance/time taken = 2/0.5 = 4miles per hour
Always borrow money from a pessimist, he doesn't expect to be paid back.
Top
Post new topic Post Reply
• Page 1 of 1