EASA NAV(A)basic
An aircraft covers 120 NM at a groundspeed of 120 kt. How long does the leg take?
Answer
1 hour
Explanation
Time is distance divided by groundspeed: $120\,NM/120\,kt=1$ hour. The units cancel because a knot is one nautical mile per hour. **Key takeaway:** $t=D/GS$.\n\n**Glossary:** **Groundspeed**: speed relative to the ground; **knot**: one nautical mile per hour.
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