A certain car travels a mile at 60 mph. It spends one second : PS Archive
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# A certain car travels a mile at 60 mph. It spends one second

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SVP
Joined: 03 Feb 2003
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A certain car travels a mile at 60 mph. It spends one second [#permalink]

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17 Jul 2003, 00:44
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A certain car travels a mile at 60 mph. It spends one second less to travel the next mile. What is its average speed for the second mile?
SVP
Joined: 03 Feb 2003
Posts: 1603
Followers: 8

Kudos [?]: 245 [0], given: 0

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17 Jul 2003, 01:33
As one test votary advises me to do, I say—yes, but why?
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17 Jul 2003, 03:26
stolyar wrote:
As one test votary advises me to do, I sayтАФyes, but why?

Speed for 1st mile = 60mph
which means 60 miles in 60 minutes,
which means 1 mile in 1 minute.

second mile takes 1 second less. therefore 59 seconds for second mile.

1 mile- 59 sec
Implies-> 60/59 miles in 1 minute.
Implies-> (60*60)/59 miles in 1 hr. which is the speed in mph.
SVP
Joined: 03 Feb 2003
Posts: 1603
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Kudos [?]: 245 [0], given: 0

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17 Jul 2003, 06:25
My version:

time for the second mile in hours= 1/60-1/3600=59/3600
speed=1 mile/time = 3600/59
17 Jul 2003, 06:25
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