MotionLab

Speed / Distance / Time

d = v · t, v = d / t, t = d / v.

Distance

Speed

Time

Distance = v · t

100

d = v · t

Speed = d / t: 20
Time = d / v: 5

What you entered

Distance: 100Speed: 20Time: 5

1
Distance = speed × time
20 × 5= 100
2
Speed = distance ÷ time
100 ÷ 5= 20
3
Time = distance ÷ speed
100 ÷ 20= 5

Result

Distance = v · t: 100

The distance, speed, and time formulas are all rearrangements of the same relationship — d = v × t.

Speed, distance and time solved three ways

Each row shows all three outputs from the same inputs: distance from speed and time, speed from distance and time, and time from distance and speed.

Distance (m)	Speed (m/s)	Time (s)	Distance out	Speed out	Time out
100	20	5	100.000	20.000	5.000
500	25	20	500.000	25.000	20.000
1000	50	20	1000.000	50.000	20.000
10	5	2	10.000	5.000	2.000
42.195	12	3.5	42.000	12.056	3.516

In the first four rows the inputs are already consistent, so each output matches the corresponding input exactly - which is a useful way to check you have entered a self-consistent set. The last row deliberately does not balance: 12 m/s for 3.5 s covers 42.000 m, not 42.195, so the distance output disagrees with the distance input and the derived speed and time differ slightly too. That is the calculator showing you which of your three figures is inconsistent with the other two. Keep units consistent throughout - mixing kilometres with seconds is the usual error.

One relationship, three formulas

Distance, speed, and time are locked together by a single relationship (d = v·t) — rearranging it gives you speed (d÷t) or time (d÷v) depending on which two you already know.

Everyday trip planning

Estimating arrival time on a road trip, figuring out pace for a run, or calculating how far a vehicle travels at a given speed are all direct applications of this formula.

Frequently asked questions

I need to drive 280 miles at 65 mph. How long will it take?

Time = distance/speed = 280/65 = 4.31 hours = 4 hours 18 minutes. Add time for stops, traffic, and speed variations. At 75 mph: 3 hours 44 minutes — saving 34 minutes but using more fuel.

I ran 5K in 25 minutes. What was my pace?

Speed = 5 km / (25/60 hours) = 12 km/h. Per-mile pace: 25 min ÷ 3.107 miles = 8:03 per mile. Per-km pace: 25/5 = 5:00 per km. Competitive recreational runners target 5:00–6:00 min/km.

How far can a plane fly in 3 hours at 550 mph?

Distance = speed × time = 550 × 3 = 1,650 miles. That's roughly New York to Miami (1,280 mi) with room to spare, or about two-thirds of the way across the continental US.

How is speed different from velocity?

Speed is a scalar — just a number (60 mph). Velocity is a vector — speed plus direction (60 mph north). A car driving in circles has constant speed but constantly changing velocity. This calculator handles speed; see the velocity calculator for vector problems.