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m08q34 [#permalink] New post 12 Dec 2010, 04:58
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A plane takes off from a hill at 750 meters above sea level and lands some time later in a town located at 50 meters below sea level. During the first part of its flight, the plane gained height at a rate of 50 meters per minute but then it started to descend at a rate of 20 meters per minute. The duration of the first part of the flight was what percent of the total flight time?

1.The duration of the descent is known.
2.The total flight time is known.

This qn is already discussed . But I still dont undesrtand the logic.

I have translated the qn to a figure(attached with this prob),as per my understanding.
Attachment:
m08q34.gif
m08q34.gif [ 4.11 KiB | Viewed 405 times ]

b = distance travelled while gaining height at a rate of 50mps
c+d= distance travelled while descending at a rate of 20mps
Qn asks for T(b)/T(c+d)
where Tb= Time to ascent ;ie time to travel distance of b.
T=Total time.time to cover b+c+d

Is there anything wrong in my understanding ? I am not sure how to proceed further .
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Re: m08q34 [#permalink] New post 12 Dec 2010, 20:02
No response even after a day !!
Wonder ..is the qn so difficult or is the qn so simple ..that nobody is answering !
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Re: m08q34 [#permalink] New post 12 Dec 2010, 21:02
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Don't bother about distance traveled towards x-axis. Consider only the y-axis, i.e. going up and coming down. That is what is discussed and the rate (50 and 20) mentioned is in terms of height gained or lost.


So, say if t1 is time for going up and t2 is time taken while going down :

20t2 = 750+50t1-(-50)
=> 20 t2 = 800 + 50 t1 ---1

We need to find : t1/(t1+t2) * 100

Statement 1: If t2 is known, we can calculate t1, hence the % can be calculated - Sufficient

Statement 2: If (t1+t2) is known, say t1+t2 = K (some constant) --- 2

Then we have two independent equations in terms of t1 and t2. So, again we can calculate the % - Sufficient

Hence the answer should be D.

Hope, it helps.
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Re: m08q34 [#permalink] New post 13 Dec 2010, 05:22
Thanks ! I have spent more than 1 hour ! Just one word "height" made all the difference !
Re: m08q34   [#permalink] 13 Dec 2010, 05:22
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