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A windmill is taking advantage of strong air currents in order to prod

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A windmill is taking advantage of strong air currents in order to prod  [#permalink]

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New post 28 Jun 2016, 06:01
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Difficulty:

  45% (medium)

Question Stats:

82% (01:37) correct 18% (01:41) wrong based on 19 sessions

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A windmill is taking advantage of strong air currents in order to produce electrical energy. On a typical day the wind speed is around 20 mph and in that speed the windmill produces 800 kw/h (kilowatts per hour). On a stormy day a windmill produces 20% more energy. How much kw/h can three windmills produce in two hours on a stormy day?

A. 2880.
B. 4860.
C. 5780.
D. 5760.
E. 6380.
Spoiler: OA

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Re: A windmill is taking advantage of strong air currents in order to prod  [#permalink]

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New post 28 Jun 2016, 07:03
Bunuel wrote:
A windmill is taking advantage of strong air currents in order to produce electrical energy. On a typical day the wind speed is around 20 mph and in that speed the windmill produces 800 kw/h (kilowatts per hour). On a stormy day a windmill produces 20% more energy. How much kw/h can three windmills produce in two hours on a stormy day?

A. 2880.
B. 4860.
C. 5780.
D. 5760.
E. 6380.


1 windmill:

Normal Day = 800 kw/h
Stormy Day = 800*1.2=960 kw/h

3 windmills for 2 hours on stormy day
960*3*2=5760

Answer: D
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Re: A windmill is taking advantage of strong air currents in order to prod  [#permalink]

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New post 28 Jun 2016, 09:20
Bunuel wrote:
A windmill is taking advantage of strong air currents in order to produce electrical energy. On a typical day the wind speed is around 20 mph and in that speed the windmill produces 800 kw/h (kilowatts per hour). On a stormy day a windmill produces 20% more energy. How much kw/h can three windmills produce in two hours on a stormy day?

A. 2880.
B. 4860.
C. 5780.
D. 5760.
E. 6380.


Efficiency per machine = 800 watt/hr
Efficiency due to increase in wind speed = 800*120% => 960 watt/hr

Production by each machine in 2 hours is 960*2 => 1920 watt

Production by 3 machines => 1920 watt * 3 = 5760 watt

Answer will be (D)
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Re: A windmill is taking advantage of strong air currents in order to prod  [#permalink]

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New post 29 Jun 2016, 05:59
(800+160)*2*3 = 5760 = D


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Re: A windmill is taking advantage of strong air currents in order to prod   [#permalink] 29 Jun 2016, 05:59
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