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07 Nov 2018, 09:52
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D
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78% (00:55) correct
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Car X and car Y ran a 500-kilometer race. What was the average speed of car X?
(1) Car X completed the race in 6 hours and 40 minutes.
(2) Car Y, at an average speed of 100 kilometers per hour, completed the race I hour and 40 minutes before car X crossed the finish line.
(1) Car X completed the race in 6 hours and 40 minutes.
(2) Car Y, at an average speed of 100 kilometers per hour, completed the race I hour and 40 minutes before car X crossed the finish line.
07 Nov 2018, 10:37
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Distance is given. Dist for X = Dist for Y = 500km.
Stmt 1: Time for X is given. So Avg Speed can be calculated. Hence Sufficient.
Stmt 2: Avg Speed for Y is given, so Time for Y = Dist for Y/Avg Speed for Y = 500/100 = 5 hrs. Now, it is given that X took 1 hour and 40 minutes more. So, Time for X = 6 hours 40 min, distance for X is known, again, average speed can be calculated. Hence Sufficient.
Hence Option D
Stmt 1: Time for X is given. So Avg Speed can be calculated. Hence Sufficient.
Stmt 2: Avg Speed for Y is given, so Time for Y = Dist for Y/Avg Speed for Y = 500/100 = 5 hrs. Now, it is given that X took 1 hour and 40 minutes more. So, Time for X = 6 hours 40 min, distance for X is known, again, average speed can be calculated. Hence Sufficient.
Hence Option D
07 Nov 2018, 11:47
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gmatbusters
Car X and car Y ran a 500-kilometer race. What was the average speed of car X?
(l) Car X completed the race in 6 hours and 40 minutes.
(2) Car Y, at an average speed of 100 kilometers per hour, completed the race I hour and 40 minutes before car X crossed the finish line.
(l) Car X completed the race in 6 hours and 40 minutes.
(2) Car Y, at an average speed of 100 kilometers per hour, completed the race I hour and 40 minutes before car X crossed the finish line.
Average Speed = Distance / Time
Total Distance = 500
Statement 1: Time is mentioned . So we can calculate the speed. Sufficient.
Statement 2: comparative rate is given. Y needs 5 hours as y runs at a speed of 100 km and y has finished the race 1 hour and 40 minutes before the x finished the race. So X needs total 6 hours and 40 minutes. So we can figure out the speed. Sufficient.
The best answer is D.
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