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Two dung beetles start to run simultaneously towards each other when

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Two dung beetles start to run simultaneously towards each other when  [#permalink]

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New post 13 Sep 2019, 01:47
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Question Stats:

85% (01:43) correct 15% (02:34) wrong based on 26 sessions

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Two dung beetles start to run simultaneously towards each other when theyre 150 feet apart. The first beetle runs at a speed of 20 feet per minute and the second beetle runs at a speed of 10 feet per minute. At the moment they start running towards each other a fly leaves the first beetle and flies towards the second one at a speed of 70 feet per minute, when he gets there he turns around and starts to fly towards the first beetle and so on. What is the total distance in feet that the fly will travel until the beetles meet?

A. 250.
B. 200.
C. 300.
D. 350.
E. 400.

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Re: Two dung beetles start to run simultaneously towards each other when  [#permalink]

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New post 13 Sep 2019, 03:00
Bunuel wrote:
Two dung beetles start to run simultaneously towards each other when theyre 150 feet apart. The first beetle runs at a speed of 20 feet per minute and the second beetle runs at a speed of 10 feet per minute. At the moment they start running towards each other a fly leaves the first beetle and flies towards the second one at a speed of 70 feet per minute, when he gets there he turns around and starts to fly towards the first beetle and so on. What is the total distance in feet that the fly will travel until the beetles meet?

A. 250.
B. 200.
C. 300.
D. 350.
E. 400.


total relative speed of beetles ; 30 ft per min and time until they meet ; 150/30 ; 5 mins
so fly will cover distance ; 5*70 ; 350 mts
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Re: Two dung beetles start to run simultaneously towards each other when   [#permalink] 13 Sep 2019, 03:00
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