Question

An SR 71 flew with a top speed of over 400km/h. How long did it take to fly from Washington to Moscow, a distance of 8300 km.

Answer 1

We can find the time that an SR 71 takes to fly from Washington to Moscow from the formula:

$$t=\dfrac{s}{v}=\dfrac{8300\ km}{400\ \dfrac{km}{h}}=20.75\ h.$$