# Earth's diameter

The Earth's diameter on the equator is approximately 12750 km. How long does the Gripen flyover the Earth above the equator at 10 km if it is at an average speed of 1500 km / h?

Correct result:

t =  26.745 h

#### Solution:

$D=12750 \ \text{km} \ \\ a=10 \ \text{km} \ \\ o=\pi \cdot \ (D + 2 \cdot \ a)=3.1416 \cdot \ (12750 + 2 \cdot \ 10) \doteq 40118.1382 \ \text{km} \ \\ v=1500 \ \text{km/h} \ \\ t=o / v=40118.1382 / 1500=26.745 \ \text{h}$

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