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One person travels from X to Y and then from Y to X. He takes differen

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One person travels from X to Y and then from Y to X. He takes differen  [#permalink]

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New post 27 Jun 2017, 15:33
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One person travels from X to Y and then from Y to X. He takes different routes back and forth. It took him 36 miles per hour to move from X to Y, and it took him 48 miles per hour to come from Y to X. What was the average speed of his entire travel?

1) The distance of the return trip was 24% of the entire travel distance.
2) The distance of the return trip is 100 miles.
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Re: One person travels from X to Y and then from Y to X. He takes differen  [#permalink]

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New post 27 Jun 2017, 20:12
aazt wrote:
One person travels from X to Y and then from Y to X. He takes different routes back and forth. It took him 36 miles per hour to move from X to Y, and it took him 48 miles per hour to come from Y to X. What was the average speed of his entire travel?

1) The distance of the return trip was 24% of the entire travel distance.
2) The distance of the return trip is 100 miles.


Hi,
We have two parts of the routes and we are given average speed of the TWO parts separately..
1) If the two parts are EQUAL, then just add the two speeds and divide by 2.
2) If the two parts are UNEQUAL, either there values are required or just the RATIO of two parts relative to each other or to total distance is sufficient


Let's see the statements..
1) return trip is 24% of Total.
Onward trip 36mph and return trip 48mph.
So answer can be found.
Sufficient
2) return trip is 100miles.
Nothing about total or initial journey
Insufficient

A
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Re: One person travels from X to Y and then from Y to X. He takes differen  [#permalink]

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New post 02 Jul 2017, 02:06
aazt wrote:
One person travels from X to Y and then from Y to X. He takes different routes back and forth. It took him 36 miles per hour to move from X to Y, and it took him 48 miles per hour to come from Y to X. What was the average speed of his entire travel?

1) The distance of the return trip was 24% of the entire travel distance.
2) The distance of the return trip is 100 miles.


Given speed of route from X to Y (36 mph) and speed of route from Y to X(48 mph).

1) The distance of the return trip was 24% of the entire travel distance.
Let Total distance be D.
Distance from Y to X is 24% of D.
Distance from X to Y will be = D - 24% of D.
We have the distance and the speed. We can find the time and average speed. Hence I is Sufficient.

2) The distance of the return trip is 100 miles.
Does not provide any information about total distance or distance from X to Y or time. Hence we cannot find the average speed. Hence II is Not Sufficient.

Answer (A)...
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Re: One person travels from X to Y and then from Y to X. He takes differen   [#permalink] 02 Jul 2017, 02:06
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One person travels from X to Y and then from Y to X. He takes differen

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