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Brainteaser: How many litres of water are there in the Atlantic ocean.

Anonymous A

Hi could someone give me their solution approach to this question for comparison?

Thanks in advance!

Vlad replied on 03/06/2018
McKinsey / Accenture / Got all BIG3 offers / More than 300 real MBB cases / Harvard Business School

Hi,

I will use the following approach:

You may use the speed of a plain as the benchmark and assume that the Ocean 1/2 of a Sphere:

  • It takes X hours to fly from A to B over the Atlantic Ocean
  • The average speed of a plane is Z
  • Thus the radius of the Ocean is 1/2 * X* (Z-1) (Because it takes extra hour to take off and land)
  • The volume of the sphere is 4/3 * p* rˆ3
  • The volume of the Ocean is 1/2 * 4/3 * p * rˆ3 (Half of the sphere)

Best

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