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28 Apr 2017, 12:01
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
69% (01:50) correct
31%
(02:03)
wrong
based on 163
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Two trucks are parked at Lucy's Diner. Chuck takes off, at 50 miles per hour, heading due east at 9 a.m. in one of the trucks. Two hours later Patricia takes off, at 70 miles per hour, in the other truck heading due west. How long from Chuck's departure time will it be until they are 700 miles apart?
A. 3 hrs. 11 minutes
B. 5 hrs.
C. 5 hrs. 50 minutes
D. 7 hrs.
E. 11 hrs. 40 minutes
A. 3 hrs. 11 minutes
B. 5 hrs.
C. 5 hrs. 50 minutes
D. 7 hrs.
E. 11 hrs. 40 minutes
28 Apr 2017, 12:11
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Chuck at 2 hours would have traveled 100 miles.
After Patricia starts driving,
Chuck and Patricia drive at their speeds 50 miles/hr and 70 miles/hr. As they are moving in the opposite direction, their net speed is 120 miles/hr.
They need to travel another 600 miles to be 700 miles apart as they are travelling in the opposite direction. This will take them another 5hours(600 miles/120 miles/hour)
So time taken from Chuck's departure time is 7 hours(Option D)
Sent from my LG-H818 using GMAT Club Forum mobile app
After Patricia starts driving,
Chuck and Patricia drive at their speeds 50 miles/hr and 70 miles/hr. As they are moving in the opposite direction, their net speed is 120 miles/hr.
They need to travel another 600 miles to be 700 miles apart as they are travelling in the opposite direction. This will take them another 5hours(600 miles/120 miles/hour)
So time taken from Chuck's departure time is 7 hours(Option D)
Sent from my LG-H818 using GMAT Club Forum mobile app
28 Apr 2017, 12:58
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You can also do process elimination for this.
Let's look at D
First work out how many miles Chuch drove within 2 hrs
50 x 2 = 100
Then multiply 500 by 5 then add it by 100
(500 x 5) + 100 = 350 miles
Patricia drove
70 x 5 = 350 miles
350 + 350 = 700 miles apart
Therefore, the answer is D
Let's look at D
First work out how many miles Chuch drove within 2 hrs
50 x 2 = 100
Then multiply 500 by 5 then add it by 100
(500 x 5) + 100 = 350 miles
Patricia drove
70 x 5 = 350 miles
350 + 350 = 700 miles apart
Therefore, the answer is D
