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If two projectiles are launched at the same moment from 1320 miles apa

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BSchool Thread Master
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Joined: 19 Feb 2010
Posts: 357
If two projectiles are launched at the same moment from 1320 miles apa  [#permalink]

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New post 16 Sep 2010, 07:22
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

77% (01:25) correct 23% (01:01) wrong based on 74 sessions

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If two projectiles are launched at the same moment from 1320 miles apart and travel directly towards each other at 480 miles per hour and 510 miles per hour, respectively, how many minutes will it take for them to meet?

A. 40
B. 44
C. 80
D. 88
E. 90
Intern
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Joined: 18 Jul 2010
Posts: 45
Re: If two projectiles are launched at the same moment from 1320 miles apa  [#permalink]

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New post 16 Sep 2010, 07:33
480 miles for A in one hour so 160 miles in 20 minutes
510 miles for B in one hour so 170 miles in 20 minutes


480 + 510 = 990
160 + 170 = 330

990 + 330 = 1320 ----> ANS : C
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Re: If two projectiles are launched at the same moment from 1320 miles apa  [#permalink]

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New post 16 Sep 2010, 07:33
C

80 min

480t + 510t = 1320

t = 44/33 = 4/3 hr = 80 mins...
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Re: If two projectiles are launched at the same moment from 1320 miles apa  [#permalink]

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New post 09 Mar 2018, 08:17
alexn49 wrote:
480 miles for A in one hour so 160 miles in 20 minutes
510 miles for B in one hour so 170 miles in 20 minutes


480 + 510 = 990
160 + 170 = 330

990 + 330 = 1320 ----> ANS : C


S = D/T

Speed will be combined as both the objects are approaching towards each other, Therefore
S = 480 m/h + 510 m/hr = 990 m/hr = 990/60 m/min (conver it min coz answer required in min)
D = Distance between two objects = 1320
T = D/T = 1320/(990/60) = 1320/(33/2) = 1320*2/33 = 240/3 = 80

Thanks :thumbup:
GMAT Club Bot
Re: If two projectiles are launched at the same moment from 1320 miles apa &nbs [#permalink] 09 Mar 2018, 08:17
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