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At 1:00, Jack starts to bicycle along a 60 mile road at a constant speed of 15 miles per hour. Thirty minutes earlier, Scott started bicycling towards Jack on the same road at a constant speed of 12 miles per hour. At what time will they meet?

Re: At 1:00, Jack starts to bicycle along a 60 mile road at a constant spe [#permalink]

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13 Feb 2015, 12:13

1

This post received KUDOS

Bunuel wrote:

At 1:00, Jack starts to bicycle along a 60 mile road at a constant speed of 15 miles per hour. Thirty minutes earlier, Scott started bicycling towards Jack on the same road at a constant speed of 12 miles per hour. At what time will they meet?

A. 1:30 B. 3:00 C. 5:00 D. 6:00 E. 9:00

Kudos for a correct solution.

13:30 Scott 12m 14:30 Scott 24m 15:30 Scott 36m -> 15:00 Scott 36 - 6m = 30m

At 1:00, Jack starts to bicycle along a 60 mile road at a constant speed of 15 miles per hour. Thirty minutes earlier, Scott started bicycling towards Jack on the same road at a constant speed of 12 miles per hour. At what time will they meet?

A. 1:30 B. 3:00 C. 5:00 D. 6:00 E. 9:00

Kudos for a correct solution.

IN THESE QUESTIONS WE FIND THE DISTANCE BETWEEN TWO WHEN BOTH ARE MOVING AND THEN FIND THE TIME IT TAKES THE FASTER ONE TO COVER THAT DISTANCE... Scott has already moved for half an hour so he is 12/2 miles ahead.. =6 miles jack covers 3 miles extra each hour when compared to scott... so he will cover 6 miles in 6/3=2 hours.. 2 hours after 1:00 is 3:00...ans B
_________________

This is an example of the 'Combined Rate' question; on Test Day, they're relatively rare (you'll probably see just 1) and they're usually written in a way that requires a certain amount of real "math" work to get to the correct answer.

By using the answer choices in this question, you can actually AVOID most of the work though.

In the first sentence, we know Jack's starting time (1pm), speed (15 mph) and distance (60 miles), so we can quickly figure out how long it would take Jack to travel the entire distance (4 hours). This tells us that, at 5pm, Jack would be at the other end of the road. We know that Scott is cycling TOWARDS him though, so some time BEFORE 5PM, they'll meet. Eliminate Answers C, D and E.

With the remaining two answers, 1:30pm is much TOO early to be the meeting time. Neither Jack nor Scott is traveling fast enough to meet up that early. Eliminate A. There's only one answer left..

At 1:00, Jack starts to bicycle along a 60 mile road at a constant speed of 15 miles per hour. Thirty minutes earlier, Scott started bicycling towards Jack on the same road at a constant speed of 12 miles per hour. At what time will they meet?

Explanation: Solution: B The relevant formula is Rate x Time = Distance. If Jack's time is t, then Scott's time is t + .5, since he started one-half hour earlier. Jack's distance is therefore 15t, and Scott's distance is 12 (t + .5). The sum of their distances will be the distance apart that they started. Therefore we can say that 15t + 12 (t + .5) = 60. This simplifies to 15t + 12t + 6 = 60, which means that 27t = 54, and t = 2. Since Jack left at 1:00, and his time was t, he met Scott at 3:00.
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Re: At 1:00, Jack starts to bicycle along a 60 mile road at a constant spe [#permalink]

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23 Jan 2017, 17:38

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Re: At 1:00, Jack starts to bicycle along a 60 mile road at a constant spe [#permalink]

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08 Feb 2017, 11:12

Scott has already moved for half an hour so he is 12/2 miles ahead.. =6 miles jack covers 3 miles extra each hour when compared to scott... so he will cover 6 miles in 6/3=2 hours.. 2 hours after 1:00 is 3:00...ans B
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I welcome analysis on my posts and kudo +1 if helpful. It helps me to improve my craft.Thank you

Re: At 1:00, Jack starts to bicycle along a 60 mile road at a constant spe [#permalink]

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18 Mar 2017, 20:40

Distance Traveled by Jockey = 6 + Distance Traveled by Scott Lets Say they will meet after T hours. 15T = 12T + 6 T=2 Hours therefore, They Will meet @ 03:00 pm

Re: At 1:00, Jack starts to bicycle along a 60 mile road at a constant spe [#permalink]

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13 Aug 2017, 20:57

Bunuel wrote:

At 1:00, Jack starts to bicycle along a 60 mile road at a constant speed of 15 miles per hour. Thirty minutes earlier, Scott started bicycling towards Jack on the same road at a constant speed of 12 miles per hour. At what time will they meet?

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