GRE Prep Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Points A and B are separated by 50 miles on a straight road.
[#permalink]
01 Feb 2020, 09:30
01 Feb 2020, 09:30
Expert Reply
2
Bookmarks
00:00
Question Stats:
84% (00:54) correct
16% (01:06) wrong based on 25 sessions
Hide Show timer Statistics
Points A and B are separated by 50 miles on a straight road. Cyclist A leaves point A, heading toward point B, at a constant speed of 15 miles per hour. At the same time, cyclist B leaves point B, traveling toward point A, at a constant speed of 10 miles per hour. How many minutes have elapsed when the two cyclists meet?
Kudos for the right answer and explanation
Show: :: OA
120
Kudos for the right answer and explanation
Re: Points A and B are separated by 50 miles on a straight road.
[#permalink]
03 Feb 2020, 10:07
03 Feb 2020, 10:07
1
A: rate 15 miles/ hour
B: rate 10 miles / hour
--> combined rate = 25 [miles / hour]
--> 50 [miles] / 25 [miles / hour] = 2 hours
--> question asks for minutes --> 2 * 60 = 120
B: rate 10 miles / hour
--> combined rate = 25 [miles / hour]
--> 50 [miles] / 25 [miles / hour] = 2 hours
--> question asks for minutes --> 2 * 60 = 120
Re: Points A and B are separated by 50 miles on a straight road.
[#permalink]
05 Jun 2020, 11:14
05 Jun 2020, 11:14
1
Even if you can't think through the full math on this one, given that these two cyclists are on a 50 mile road each going 15mph and 10mph, you can basically do this whole thing manually almost immediately when you see that the numbers are really simple.
At hour 1, you know that cyclist A has traveled 15 miles total, and cyclist B has traveled 10 miles total. You can also logically conclude that they haven't met yet.
At hour 2, you know that cyclist A has traveled 30 miles total, and cyclist B has traveled 20 miles total. Knowing that 30 + 20 = 50 (the length of the road), you can conclude that this is the moment when the cyclists meet, at 2 hours which is 120 minutes.
At hour 1, you know that cyclist A has traveled 15 miles total, and cyclist B has traveled 10 miles total. You can also logically conclude that they haven't met yet.
At hour 2, you know that cyclist A has traveled 30 miles total, and cyclist B has traveled 20 miles total. Knowing that 30 + 20 = 50 (the length of the road), you can conclude that this is the moment when the cyclists meet, at 2 hours which is 120 minutes.
