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Jeff and Tim begin a bike ride in opposite directions at 6

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Intern
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Joined: 17 Aug 2003
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Jeff and Tim begin a bike ride in opposite directions at 6 [#permalink] New post 02 Jan 2004, 16:46
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Jeff and Tim begin a bike ride in opposite directions at 6 a.m. from the same spot, at speeds of 30 kph and 20 kph, respectively. When will they be 120 kilometers apart?

A) 7:30 a.m.

B) 7:48 a.m.

C) 8:24 a.m.

D) 8:36 a.m.

E) 9:12 a.m.
Intern
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Joined: 24 Nov 2003
Posts: 30
Location: Champaign
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 [#permalink] New post 02 Jan 2004, 17:30
C

speed = distance/time

=> time = distance/speed

speed (relative) = 20 + 30 since they go in diff dirs. = 50 kmph

time taken for 120 km = 120km/50 kmph = 2.4 hrs

=> 6am + 2 hrs & 24 mins = 8.24am
  [#permalink] 02 Jan 2004, 17:30
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Jeff and Tim begin a bike ride in opposite directions at 6

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