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A driver completed the first 20 miles of a 40 miles trip at

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Manager
Manager
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B
Joined: 02 Jan 2017
Posts: 90

Kudos [?]: 2 [0], given: 23

Location: Pakistan
Concentration: Finance, Technology
GMAT 1: 650 Q47 V34
GPA: 3.41
WE: Business Development (Accounting)
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Re: A driver completed the first 20 miles of a 40 miles trip at [#permalink]

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New post 10 Dec 2017, 03:27
WholeLottaLove wrote:
I know how to solve this problem, but what happens if the distances traveled are different? In other words, in this problem we were told he covered one half of the distance @50 mph but what if he covered 1/3rd of the distance at 50 mph?




It will not matter if it is half of 50 or 1/3rd of 50 miles. Whatever the distance that may be traveled is to be divided by the speed it was covered at. Why? Because we want to find out one chunk of the time till that distance and find the rest chunk using the journey's average speed ( 60 Miles hour).

As average speed = total distance travelled/ Total time

Kudos [?]: 2 [0], given: 23

Manager
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S
Joined: 22 May 2015
Posts: 97

Kudos [?]: 48 [0], given: 22

Re: A driver completed the first 20 miles of a 40 miles trip at [#permalink]

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New post 31 Dec 2017, 23:42
Average Speed = Total Distance / Total Time

60 = 40 / (t1+t2)

20 = 50 * t1 , 20 = x * t2

solving we get x = 75mph
_________________

Consistency is the Key

Kudos [?]: 48 [0], given: 22

Re: A driver completed the first 20 miles of a 40 miles trip at   [#permalink] 31 Dec 2017, 23:42

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A driver completed the first 20 miles of a 40 miles trip at

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