The typical speed of Boeing 777-300ER on the way from Warsaw to New York is 916 km/h (569 mph). On its way back it reaches 1140 km/h (708 mph). How is it possible?

it flies at higher altitude

jet stream helps

air convection helps

plane is lighter on way back

The location of the jet stream is extremely important for aviation. Commercial use of the jet stream began on 18 November 1952, when Pan Am flew from Tokyo to Honolulu at an altitude of 7,600 metres, cutting the trip time by over one-third.

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Adrian Pingstone wikipedia → Jet stream

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Answers by country

Thailand

92%

Austria

90%

Italy

88%

Norway

72%

16%

the United States

11%

66%

11%

591

the United Kingdom

10%

66%

14%

332

Spain

66%

16%

South Africa

11%

66%

16%

Australia

12%

62%

14%

Canada

61%

17%

Germany

10%

59%

17%

173

Unknown

58%

29%

the Netherlands

57%

28%

France

57%

23%

Poland

12%

52%

22%

18515

Republic of Ireland

18%

51%

28%

Greece

13%

46%

28%

the Philippines

36%

16%

12%

India

20%

35%

28%

172

Nigeria

50%

12%

18%

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In moderate and cold climates, a tree gains one ring every year, which allows us to estimate its age. Where else we can estimate age in similar fashion?

on the beach, layers of sand and grit

at the bottom of the lake, sedimentation

in the craters, pyroclastic rocks

in the glaciers, layers of clay and sand