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John traveled 150 miles. What is the average speed of John on the trip

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John traveled 150 miles. What is the average speed of John on the trip  [#permalink]

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New post 18 Feb 2017, 08:12
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A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

61% (00:47) correct 39% (01:01) wrong based on 118 sessions

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John traveled 150 miles. What is the average speed of John on the trip?

1) John traveled the first 100 miles at the rate of 50 miles per hour
2) John traveled the last 100 miles at the rate of 50 miles per hour

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Re: John traveled 150 miles. What is the average speed of John on the trip  [#permalink]

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New post 18 Feb 2017, 11:23
1
MathRevolution wrote:
John traveled 150 miles. What is the average speed of John on the trip?

1) John traveled the first 100 miles at the rate of 50 miles per hour
2) John traveled the last 100 miles at the rate of 50 miles per hour



1) no info on next 50 km...insuff
2) no info on first 50km...insuff

Combining we dont know the avg speed john maintained in the first 50 or last 50 or any else
we have combined avg speed of 100km as 50mph
thus insuff

Ans E
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Re: John traveled 150 miles. What is the average speed of John on the trip  [#permalink]

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New post 18 Feb 2017, 12:30
It is a 150 mile drive. If John traveled first 100 miles at 50 mph and he also traveled last 100 mile at 50 mph. That means he travelled the whole 150 mile at 50 mph !

Answer should be C
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Re: John traveled 150 miles. What is the average speed of John on the trip  [#permalink]

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New post 18 Feb 2017, 13:03
beefcakeharsh wrote:
It is a 150 mile drive. If John traveled first 100 miles at 50 mph and he also traveled last 100 mile at 50 mph. That means he travelled the whole 150 mile at 50 mph !

Answer should be C



U dont have the speed (ie speed may vary for those 100km) breakup

avg. speed = total distance/ total time
suppose for 100 km he may covered 75mph @ 75mph and another 25miles @ 25mph then his speed is 50mph
or,
100miles covered in 15 miles @ 10mph and another 85 miles @ 170mph then again his speed is 50mph.

also notice such variance is speed may be for either of the 100miles covered in both options.
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Re: John traveled 150 miles. What is the average speed of John on the trip  [#permalink]

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New post 19 Feb 2017, 18:43
==> In the original condition, he travels the total 150 miles by dividing it to two trips of 50 miles each. Hence, since there are 6 variables, E is most likely to be the answer. In order for C to be the answer, there must be a word “constant rate” mentioned.

Therefore, E is the answer.
Answer: E
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Re: John traveled 150 miles. What is the average speed of John on the trip  [#permalink]

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New post 17 Jul 2018, 21:56
Combining both (1) and (2), it can be inferred that the avg speed is 50 mph. I think the answer is C.
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Re: John traveled 150 miles. What is the average speed of John on the trip &nbs [#permalink] 17 Jul 2018, 21:56
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