Home > Exam Quiz Archive > Quiz ATPL - Exam test Airline Transport Pilot license > Flight Planning and Monitoring > Given:X = Distance A to point of equal time (PET) between A and B E = EnduranceD = Distance A to B O = Groundspeed 'on'H = Groundspeed 'back'The formula for calculating the distance X to point of equal time (PET) is:

X = D x H / (O + H) |

X = D x O x H / (O + H) |

X = E x H / (O + H) |

X = D x O / (O + H) |

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#### Explanation: Given:X = Distance A to point of equal time (PET) between A and B E = EnduranceD = Distance A to B O = Groundspeed 'on'H = Groundspeed 'back'The formula for calculating the distance X to point of equal time (PET) is:

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