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15 Dec 2010, 08:26
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D
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Difficulty:
25%
(medium)
Question Stats:
70% (01:16) correct
30%
(01:30)
wrong
based on 205
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How many miles long is the route from Danton to Griggston?
(1) It will take 1 hour longer to travel the entire route at an average rate of 45 miles per hour than at an average rate of 50 miles per hour.
(2) It will take 15 hours to travel the first half of the route at an average rate of 15 miles per hour.
(1) It will take 1 hour longer to travel the entire route at an average rate of 45 miles per hour than at an average rate of 50 miles per hour.
(2) It will take 15 hours to travel the first half of the route at an average rate of 15 miles per hour.
15 Dec 2010, 08:33
Kudos
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rxs0005
How many miles long is the route from Danton to Griggston?
(1) It will take 1 hour longer to travel the entire route at an average rate of 45 miles per hour than at an average rate of 50 miles per hour.
(2) It will take 15 hours to travel the first half of the route at an average rate of 15 miles per hour.
(1) It will take 1 hour longer to travel the entire route at an average rate of 45 miles per hour than at an average rate of 50 miles per hour.
(2) It will take 15 hours to travel the first half of the route at an average rate of 15 miles per hour.
(1) It will take 1 hour longer to travel the entire route at an average rate of 45 miles per hour than at an average rate of 50 miles per hour --> 50t=45(t+1) --> t=9 --> distance=rate*time=450. Sufficient.
(2) It will take 15 hours to travel the first half of the route at an average rate of 15 miles per hour --> 15*15=d/2 --> d=450. Sufficient.
Answer: D.
14 Oct 2011, 12:45
Kudos
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St1: 45*(t+1) = 50 (t) , t can be calculated and hence distance
St2: Half distance is 15*15 and hence whole of distance can be calculated.
Hence D.
St2: Half distance is 15*15 and hence whole of distance can be calculated.
Hence D.
