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× Welcome to the CPL Performance question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.

Revision exercise on ETP and PNR

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jukzizy created the topic: Revision exercise on ETP and PNR

Question 11..page 122 bobtait book..sir could you please explain further because I hardly work back wards to proof my answer if the time are the same.

300×135÷300=135nm

Time to ETP- normally it surpossed to be 135÷135=60mins

but at the back of book answers it says 135÷165=49 mins why it is 135÷165 and not 135÷135?
Got stuck on this question..
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Stuart Tait replied the topic: Revision exercise on ETP and PNR

G'day Jukzizy

Because to calculate time TO ETP you have to use the ground speed out and you have a 15kt tailwind so the ground speed is 165kt
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jukzizy replied the topic: Revision exercise on ETP and PNR

could you please do working out and explanation so that I will undersatand where I went wrong please?
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