The question asks you to find out at which time interval was the flight
closer to its destination at time - X than at time - Y. This is only possible
when the distance either remains the same or increases after the time
has passed.

If you observe the graph carefully, the only time when the graph is
moving in the opposite direction(is from t=60 to t=80)

Therefore, it is the answer that you looking for. Hope that helps!
_________________

You've got what it takes, but it will take everything you've got

Here, we are asked to find the distance w.r.t the destination in that
specific timeline. For instance if I had given you two time ranges
and asked you to compare the distances for those ranges,

Option 1 : t=10 to 20 (distance traveled 100 to 75 km) - detour due to turbulence
Option 2 : t=50 to 60 (distance traveled 275 to 375 km)

Here, the plane travels closer to the destination by 100 km in Option 2
but it travels 25 km away from the destination in Option 1. So we can
say that the plane was closer to its destination at t=10 than it was at
t=20 and Option 1 is the answer!

Hope this helps!
_________________

You've got what it takes, but it will take everything you've got

Option 1 : t=10 to 20 (distance traveled 100 to 75 km) - detour due to turbulence
Option 2 : t=50 to 60 (distance traveled 275 to 375 km)

Here, the plane travels closer to the destination by 100 km in Option 2
but it travels 25 km away from the destination in Option 1. So we can
say that the plane was closer to its destination at t=10 than it was at
t=20 and Option 1 is the answer!

Hope this helps![/quote][/quote]


HI Pushpit

Thanks for the detailed explanation.

Am afraid, but I may request you to please help me on this. Am sure we all are missing some point here which is leading to incorrect answer.

While you have explained using a hypothetical example, would you please be kind to help me/us using actual data of the graph to derive answer to Q1.

1). I think what am struggling with the concept is a plane is said to be " closer to it' destination " when the distance between plane and destination is least. I took this as my reference to derive the time slot which represents this i.e. 240/260.

2). From your example I understand that it is the maximum travelled distance between a time slot that should be the answer, but you took the time slot where we travelled only 25 kms instead of 100 kms.?

Please can you help/ or anyone please help

Thank You
Abhinav