WolframAlpha

Relative Motion of an Object Calculator

Solve for the speed of an object, the amount of time it traveled or the distance it covered moving with and against a flowing medium, such as a river.

distance traveled upstream as seen by a stationary observer:
speed traveling upstream as seen by a stationary observer:
distance traveled downstream as seen by a stationary observer:
Assuming distances traveling upstream and downstream | Use instead
Assuming time | Use instead