When to use this calculator
Find time for two approaching objects to meet. Objects approach on one straight line at constant speeds with simultaneous starts.
Explore the motion & kinematics calculators for other questions in this topic. For a related calculation, use the Projectile Flight Time Calculator: Find ideal total flight time for a projectile returning to launch height.
PUTTING IT INTO PRACTICE
Meeting Time: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Initial separation (m) | 300 |
| First approach speed (m/s) | 10 |
| Second approach speed (m/s) | 5 |
| Result | 20 s |
- Check the input labels and enter the example values above.
- Apply the relationship: Meeting time = separation/(speed one+speed two).
- The result is 20 s, rounded for display.
How to interpret your result
Objects approach on one straight line at constant speeds with simultaneous starts.
Choose a reference direction before using signed velocities. Constant-acceleration models do not capture variable braking or drag. Projectile tools explicitly state launch and landing assumptions.
Frequently asked questions
Are displacement and distance interchangeable?
No. Displacement is the signed or directed change in position; distance counts the length of the path travelled.
When is the meeting time calculator useful?
Find time for two approaching objects to meet. Objects approach on one straight line at constant speeds with simultaneous starts.
How do I use the meeting time calculator?
Enter initial separation (m), first approach speed (m/s), second approach speed (m/s). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Meeting time = separation/(speed one+speed two).
What should I check before using the result?
Objects approach on one straight line at constant speeds with simultaneous starts.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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