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If an object travels 100 feet in 2 seconds, what is the

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If an object travels 100 feet in 2 seconds, what is the [#permalink] New post 21 Oct 2010, 17:42
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If an object travels 100 feet in 2 seconds, what is the object’s approximate speed in miles per hour? (Note: 1 mile = 5280 feet)

A. 3.4
B. 3.8
C. 34
D. 38
E. 340
[Reveal] Spoiler: OA

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Re: conversion [#permalink] New post 21 Oct 2010, 18:01
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shrive555 wrote:
If an object travels 100 feet in 2 seconds, what is the object’s approximate speed in miles per hour? (Note: 1 mile = 5280 feet)

3.4
3.8
34
38
340


i always mess such conversion questions. :x :x :x


100 feet in 2 seconds;

100*\frac{3,600}{2}=50*3,600 feet in 1 hour;

\frac{50*3,600}{5,280}\approx{34} miles in 1 hour.

Answer: C.
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Re: conversion [#permalink] New post 22 Oct 2010, 04:02
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Conversion questions are best dealt using a one step approach.
Let me illustrate: Let's say we want to convert a speed of 100 miles/hour to feet/sec.

Speed = 100 miles/1 hour = (100 x 5280 feet)/(1 x 3600 sec)= 146.67 feet/sec

So, simply convert the units to what you want along with the conversion factor.

Let's take your question now.
If an object travels 100 feet in 2 seconds, what is the object’s approximate speed in miles per hour? (Note: 1 mile = 5280 feet)

Speed = 100 feet/2 sec = (100×1/5280 miles)/(2×1/3600 hour) = 5x3600 miles/528 hr = 34 miles/hr

Note: Since 1 mile = 5280 feet, hence here to convert we say 1 foot = 1/5280 miles.
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Re: conversion [#permalink] New post 22 Oct 2010, 04:55
Bunuel wrote:
shrive555 wrote:
If an object travels 100 feet in 2 seconds, what is the object’s approximate speed in miles per hour? (Note: 1 mile = 5280 feet)

3.4
3.8
34
38
340


i always mess such conversion questions. :x :x :x


100 feet in 2 seconds;

100*\frac{3,600}{2}=50*3,600 feet in 1 hour;

\frac{50*3,600}{5,280}\approx{34} miles in 1 hour.

Answer: C.


thanks for your better explanation......
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Re: conversion [#permalink] New post 08 Jul 2012, 09:50
100 (feet)/2 (sec) *1 (mile)/5280 (feet)* 3600 (sec)/1 (hour) --> cancel out (feet) and (sec) and you will get

(100*3600)/(2*5280) = 34.09
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Re: If an object travels 100 feet in 2 seconds, what is the [#permalink] New post 19 Jul 2012, 03:25
1 mile = 5280 feet => 1 feet = 1/5280 mile

1 hr = 3600s => 1s = 1/3600 hr

If an object travels 100 feet in 2 seconds => speed = 100/2 feet/s = 50 feet/s = 50 *(1/5280) / (1 *(1/3600)) miles/hr
= 3600 * 50 / (5280) miles/hr = 18000/ 528 miles/hr ~ 18000/525 = 180 * 4/ 21 miles/hr = 240/7 miles/hr ~ 34miles/hr

So, Answer is C(34)

Hope it helps!
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Re: conversion [#permalink] New post 17 Oct 2013, 03:37
Bunuel wrote:
shrive555 wrote:
If an object travels 100 feet in 2 seconds, what is the object’s approximate speed in miles per hour? (Note: 1 mile = 5280 feet)

3.4
3.8
34
38
340


i always mess such conversion questions. :x :x :x


100 feet in 2 seconds;

100*\frac{3,600}{2}=50*3,600 feet in 1 hour;

\frac{50*3,600}{5,280}\approx{34} miles in 1 hour.

Answer: C.


Thanks! nice explanation! helped me understand.
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Re: conversion [#permalink] New post 17 Oct 2013, 03:42
Expert's post
KanupriyaS wrote:
Bunuel wrote:
shrive555 wrote:
If an object travels 100 feet in 2 seconds, what is the object’s approximate speed in miles per hour? (Note: 1 mile = 5280 feet)

3.4
3.8
34
38
340


i always mess such conversion questions. :x :x :x


100 feet in 2 seconds;

100*\frac{3,600}{2}=50*3,600 feet in 1 hour;

\frac{50*3,600}{5,280}\approx{34} miles in 1 hour.

Answer: C.


Thanks! nice explanation! helped me understand.



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Hope this helps.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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