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A two-engine aircraft has three fuel tanks. At the time of take-off, its centre tank contains 650 kg of fuel, its left and right wing tanks contain 250 kg of fuel each. A pump from the centre tank is continuously transferring fuel to the wing tanks at 150 kg/h.

On its flight from A to B, the fuel flow is 170 kg/h. 35 minutes into the flight, the centre fuel tank pump fails. From the point of the failure, how long can the aircraft fly?

  • A
    3 h 27 min
  • B
    3 h 02 min
  • C
    3 h 15 min
  • D
    2 h 52 min
  1. The centre pump transfers fuel to the wing tanks at a rate of 150 kg/h. Therefore, after 35 min of flight: 35 min x 150 kg/h = 87.5 kg of fuel would have been transferred to the wing tanks.
  2. The total fuel in the wing tanks: 250 kg + 250 kg + 87.5 kg = 587.5 kg.
  3. The fuel flow is 170 kg/h => which means that after 35 min, 35 min x 170 kg/h = 99 kg of fuel have been consumed.
  4. Remaining fuel = 587.5 kg - 99 kg = 488.5 kg
  5. Endurance left = 488.5 kg : 170 kg/h = 2 h 52 min

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