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success1111
- Senior | Next Rank: 100 Posts
- Posts: 87
- Joined: Sun Apr 19, 2009 11:07 pm
Mary passed a certain gas station on a highway while traveling west at a constant speed of 50 miles per hour. Then, 15 minutes later, Paul passed the same gas station while traveling west at a constant speed of 60 miles per hour. If both drivers maintained their speeds and both remained on the highway for at least 2 hours, how long after he passed the gas station did Paul catch up with Mary?
A. 30 min
B. 45 min
C. 1 hr
D. 1 hr 15 min
E. 1 hr 30 min
I solved this question by this way.
Distance Mary travelled by 15 minutes(catch up distance) is 50 * 15/60 = 12.5 miles
Paul catch up speed is 60-50 = 10.
Hour after Paul would catch up with mary is 12.5/10 = 1 hr 25 minutes.
I was surprised my answer was no there. Am i missing something? Please help
A. 30 min
B. 45 min
C. 1 hr
D. 1 hr 15 min
E. 1 hr 30 min
I solved this question by this way.
Distance Mary travelled by 15 minutes(catch up distance) is 50 * 15/60 = 12.5 miles
Paul catch up speed is 60-50 = 10.
Hour after Paul would catch up with mary is 12.5/10 = 1 hr 25 minutes.
I was surprised my answer was no there. Am i missing something? Please help
Trust but verify.
