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Speed, Distance, Time Calculator (km/h & m/s)

Enter distance and time to get the average speed in km/h and m/s instantly. For travel and study.

Quick answer

120 km in 1.5 h: 80 km/h.

How it is calculated

  1. Speed = distance ÷ time = 120 ÷ 1.5 = 80 km/h.
  2. km/h to m/s: × 1,000 ÷ 3,600, i.e. × 5/18.
  3. Distance = speed × time; time = distance ÷ speed.

Worked example

A 120 km trip took 1.5 hours (1 h 30 min). Average speed 80 km/h, i.e. 22.22 m/s.

Example values
Distance120 km
Time1.5 h
Result
Speed80 km/h
Speed22.22 m/s
Formula
Speed = Dk/Th
Speed = Dk/Th/3.6

Good to know

Questions people ask

What is the speed formula?

Speed = distance ÷ time.

How do I convert km/h to m/s?

Multiply by 5/18. 72 km/h = 20 m/s.

How do I write 1 h 20 min in hours?

1 + 20/60 = 1.333 h.

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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0