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A rocket is launched at 41,400 kilometers per hour. What is the speed

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A rocket is launched at 41,400 kilometers per hour. What is the speed  [#permalink]

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New post 29 Sep 2016, 04:45
2
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

71% (01:32) correct 29% (01:41) wrong based on 396 sessions

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Re: A rocket is launched at 41,400 kilometers per hour. What is the speed  [#permalink]

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New post 29 Sep 2016, 05:02
C

to convert 41400 km/hr into m/s just multiply (41400*1000)/3600= 11500 m/s
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Re: A rocket is launched at 41,400 kilometers per hour. What is the speed  [#permalink]

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New post 29 Sep 2016, 05:10
Bunuel wrote:
A rocket is launched at 41,400 kilometers per hour. What is the speed of the rocket in meters per second?

A. 115
B. 1150
C. 11,500
D. 69,000
E. 149,040



1000 meters = 1 km

1hr = 60*60 secs..

( 41400 * 1000 ) / 60 * 60 => 11500.

IMO option C.
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Re: A rocket is launched at 41,400 kilometers per hour. What is the speed  [#permalink]

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New post 29 Nov 2016, 04:04
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Bunuel wrote:
A rocket is launched at 41,400 kilometers per hour. What is the speed of the rocket in meters per second?

A. 115
B. 1150
C. 11,500
D. 69,000
E. 149,040


km/hour = 1000m/3600 sec thus the multiplier is 1000/3600 = 5/18

41400 *5/18 = 11,500m/s
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Re: A rocket is launched at 41,400 kilometers per hour. What is the speed  [#permalink]

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New post 29 Nov 2016, 11:45
Bunuel wrote:
A rocket is launched at 41,400 kilometers per hour. What is the speed of the rocket in meters per second?

A. 115
B. 1150
C. 11,500
D. 69,000
E. 149,040


Bunuel

is this a really 700 Level question??
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Re: A rocket is launched at 41,400 kilometers per hour. What is the speed  [#permalink]

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New post 29 Nov 2016, 13:05
41,400 kmph = 41.400*1000/60*60 meters per sec = 11500 meters per sec
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Re: A rocket is launched at 41,400 kilometers per hour. What is the speed  [#permalink]

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New post 02 Dec 2016, 10:33
Bunuel wrote:
A rocket is launched at 41,400 kilometers per hour. What is the speed of the rocket in meters per second?

A. 115
B. 1150
C. 11,500
D. 69,000
E. 149,040


We are given that a rocket is launched at 41,400 kilometers per hour, and we need to determine the speed of the rocket in meters per second.

We need to convert kilometers to meters and hours to seconds. We recall that 1,000 meters = 1 kilometer and 3,600 seconds = 1 hour. Thus:

41,400 km = 41,400 x 1,000 = 41,400,000 meters

Thus, the rate in meters per second is:

41,400,000/3,600 = 11,500 m/sec

Answer: C
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A rocket is launched at 41,400 kilometers per hour. What is the speed  [#permalink]

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New post 02 Dec 2016, 11:28
Bunuel wrote:
A rocket is launched at 41,400 kilometers per hour. What is the speed of the rocket in meters per second?

A. 115
B. 1150
C. 11,500
D. 69,000
E. 149,040


\(41400*\frac{5}{15}\) = \(11500\)

Answer will be (C) \(11500 \ meters/second\)
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Re: A rocket is launched at 41,400 kilometers per hour. What is the speed  [#permalink]

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New post 27 Feb 2017, 05:20
speed( m/s) = 5/18*speed(km/h) = 5/18* 41400 = 11500 m/s. Option C
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Re: A rocket is launched at 41,400 kilometers per hour. What is the speed  [#permalink]

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New post 17 Jul 2017, 04:57
I think the challenge is to solve the question in less than 2 minutes without a calculator.
Dividing 4140000 meters by 3600 sec can take a bit of time.

Fast way: (41400*1000)/3600 = (414*1000)/(9*4) = (414/4)*(1000/9)
Mental approximation: (414/4) first leg is around 111 and (1000/9) second leg is around 100
Result must be around 11,100 answer. the closest answer choice is C. All the others are too far.
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Re: A rocket is launched at 41,400 kilometers per hour. What is the speed   [#permalink] 17 Jul 2017, 04:57
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