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Xavier and Adam are riding motorcycles down the highway at constant 28 Apr 2017, 03:35
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C
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85% (hard)

Question Stats:

23% (01:28) correct 77% (01:43) wrong based on 22 sessions

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Xavier and Adam are riding motorcycles down the highway at constant speeds. If Xavier is now 2 miles ahead of Adam, how many minutes before Xavier is 3 miles ahead of Adam?

(1) Xavier is traveling 12 miles per hour faster than Adam.
(2) In 8 minutes, Xavier has increased the distance between himself and Adam by 1/2 mile.



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C
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Xavier and Adam are riding motorcycles down the highway at constant 29 Apr 2017, 00:11
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IMO D


Since we meet relative speed to calculate the time

Waiting for OA

Thanks
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Xavier and Adam are riding motorcycles down the highway at constant 30 Apr 2017, 00:35
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I am getting different answers from each option
According to A Xavier is traveling 12 mph faster than Adam
According to B it translates to 4.25 mph

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Xavier and Adam are riding motorcycles down the highway at constant 30 Apr 2017, 00:37
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Answer should be D.

This is because here we are talking about relative speeds not the actual


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Xavier and Adam are riding motorcycles down the highway at constant 02 May 2017, 04:13
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stat 1 : in one hour 12 miles are covered relative to each other,,

Hence in one minute 12/60 miles = 1/5 miles.. so in 5 minutes 1 mile is covered..
so time when their relative distance is 3 miles and 2 miles can be calculated.. suff

stat 2 : in 16 mins,, the distance increased by 1 mile... suff

ans D
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Xavier and Adam are riding motorcycles down the highway at constant 02 May 2017, 13:48
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There's something I'm being really stupid about or statements 1 and 2 are not giving the same value.

From 1, the relative speed is 12 mph, so travel 1 mile it takes 1/12 hours, or 5 mins. - suff
From 2, the time takes to cover 1/2 mile is 8 minutes, and it's given that the speed is constant, so it takes 16 minutes to cover 1 mile. - suff

Ans: D

What am I doing wrong?
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Xavier and Adam are riding motorcycles down the highway at constant 17 May 2017, 22:58
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Can anybody help here how the answer is C

IMO both statements are sufficient individually.

Thanks



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