The Speed, Distance & Time Formula
The three fundamental variables of motion are linked by a simple formula taught in every physics class in Pakistan:
Distance (D) = Speed (S) × Time (T)
Time (T) = Distance (D) ÷ Speed (S)
Our calculator lets you solve for any one variable by entering the other two. Select "Find Speed", "Find Distance", or "Find Time" from the tabs above.
Practical Examples — Pakistan Road Travel
| Route | Distance | Avg Speed | Est. Time |
|---|---|---|---|
| Lahore → Islamabad (M-2) | 375 km | 110 km/h | ~3.4 hrs |
| Karachi → Hyderabad (M-9) | 155 km | 100 km/h | ~1.6 hrs |
| Islamabad → Peshawar (M-1) | 155 km | 110 km/h | ~1.4 hrs |
| Lahore → Multan (M-4) | 340 km | 110 km/h | ~3.1 hrs |
| Rawalpindi → Murree | 32 km | 40 km/h | ~48 min |
Speed Units Explained
km/h (Kilometres per Hour)
The standard unit of speed in Pakistan for road travel, physics, and meteorology. Motorway speed limits in Pakistan are 120 km/h for cars.
m/s (Metres per Second)
Used in physics problems and scientific contexts. To convert: divide km/h by 3.6. For example, 120 km/h = 120 ÷ 3.6 = 33.3 m/s.
mph (Miles per Hour)
Used in the UK, USA. 1 mph = 1.6093 km/h. To convert 80 km/h to mph: 80 ÷ 1.6093 = 49.7 mph.
Speed in FSc Physics — Key Concepts
Uniform Speed vs. Acceleration
Uniform speed means the same distance is covered every second. When speed changes, we deal with acceleration: a = (v − u) ÷ t, where v is final velocity, u is initial velocity, and t is time.
Equations of Motion (FSc Chapter 3)
- v = u + at
- S = ut + ½at²
- v² = u² + 2aS