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A man started driving at a constant speed, from the site of a blast,

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A man started driving at a constant speed, from the site of a blast,  [#permalink]

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New post 07 Aug 2011, 17:00
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Question Stats:

85% (01:58) correct 15% (02:29) wrong based on 53 sessions

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A man started driving at a constant speed, from the site of a blast, the moment he heard the blast. He heard a second blast after a time of 30 mins and 30 sec. if the second blast occured exactly 30 mins after the first, how far was he from the site when he heard the second blast? ( Speed of sound = 330m/sec.)

A 6600m
B 13200m
C 9900m
D 3300m
E 11550m

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Re: A man started driving at a constant speed, from the site of a blast,  [#permalink]

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New post 07 Aug 2011, 17:03
I got the answer here right. But still am not 100% clear how the speed of sound determines the distance he traveled and how the 30 seconds difference helps here
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Re: A man started driving at a constant speed, from the site of a blast,  [#permalink]

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New post 10 Aug 2011, 08:42
cleetus wrote:
I got the answer here right. But still am not 100% clear how the speed of sound determines the distance he traveled and how the 30 seconds difference helps here


Let us first assume that the person is not moving and standing still. In that case he would have heard the 2nd blast exactly after 30 min.
Now as the person has moved some distance after the first blast (according to the question) the sound has to travel that extra distance to reach the person. So the delay in the time between the actual blast and the time when he heard is the time taken by sound to travel and reach him.

which is 30 sec* speed of sound = 9900 m
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Re: A man started driving at a constant speed, from the site of a blast,  [#permalink]

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New post 10 Aug 2011, 12:49
Speed of sound=330m/sec
it took 30sec for sound to reach.
Distance = 30*330=9900m
OA C.
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Re: A man started driving at a constant speed, from the site of a blast,  [#permalink]

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New post 12 Aug 2011, 00:35
actual time of the blast t
distance from the site in terms of time = 30 min

sound heard = 30 min and 30 sec meaning

30 sec is the time taken for sound hence,

30* 330 = 9900m
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Re: A man started driving at a constant speed, from the site of a blast,  [#permalink]

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Re: A man started driving at a constant speed, from the site of a blast,   [#permalink] 11 Apr 2019, 11:11
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