GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 22 Jan 2019, 00:48

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

## Events & Promotions

###### Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
• ### The winners of the GMAT game show

January 22, 2019

January 22, 2019

10:00 PM PST

11:00 PM PST

In case you didn’t notice, we recently held the 1st ever GMAT game show and it was awesome! See who won a full GMAT course, and register to the next one.
• ### Key Strategies to Master GMAT SC

January 26, 2019

January 26, 2019

07:00 AM PST

09:00 AM PST

Attend this webinar to learn how to leverage Meaning and Logic to solve the most challenging Sentence Correction Questions.

# On a trip of 60 kilometres, Rita covered the first 15 kilometres

Author Message
Manager
Joined: 03 Mar 2018
Posts: 215
On a trip of 60 kilometres, Rita covered the first 15 kilometres  [#permalink]

### Show Tags

05 Mar 2018, 06:58
00:00

Difficulty:

45% (medium)

Question Stats:

74% (03:02) correct 26% (01:50) wrong based on 19 sessions

### HideShow timer Statistics

On a trip of 60 kilometres, Rita covered the first 15 kilometres at an average speed of 75 kilometres per hour and the following 35 kilometres at an average speed of 140 kilometres per hour. At what average speed did she cover the last part of her trip if her average speed for the whole trip was 80 kilometres per hour?

(A) 3 kilometres per hour

(B) 25 kilometres per hour

(C) 30 kilometres per hour

(D) $$\frac{100}{3}$$ kilometres per hour

(E) $$\frac{200}{3}$$ kilometres per hour

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

Math Expert
Joined: 02 Aug 2009
Posts: 7212
Re: On a trip of 60 kilometres, Rita covered the first 15 kilometres  [#permalink]

### Show Tags

05 Mar 2018, 08:10
1
itisSheldon wrote:
On a trip of 60 kilometres, Rita covered the first 15 kilometres at an average speed of 75 kilometres per hour and the following 35 kilometres at an average speed of 140 kilometres per hour. At what average speed did she cover the last part of her trip if her average speed for the whole trip was 80 kilometres per hour?

(A) 3 kilometres per hour

(B) 25 kilometres per hour

(C) 30 kilometres per hour

(D) $$\frac{100}{3}$$ kilometres per hour

(E) $$\frac{200}{3}$$ kilometres per hour

total time taken = $$\frac{60*60}{80}=45 min$$
time taken for first 15 km = $$\frac{15*60}{75} = 12 min$$
time taken for next 35 km = $$\frac{35*60}{140} = 15 min$$
so time taken for remaining 60-15-35 or 10 km is 45-12-15 or 18 min..
therefore speed in kmph = $$\frac{10*60}{18}=\frac{100}{3}$$

D

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

GMAT online Tutor

Re: On a trip of 60 kilometres, Rita covered the first 15 kilometres &nbs [#permalink] 05 Mar 2018, 08:10
Display posts from previous: Sort by