Posted by **nikita** on Tuesday, September 13, 2011 at 7:14pm.

An airplane travels 2800 km at a speed of 700 km/h, decreases its speed to 500 km/h for the next 1500 km and travels the last 1000 km at a speed of 400 km/hr. Find the average speed of the plane for the trip.

- physics -
**kobe**, Thursday, October 8, 2015 at 10:15pm
558km/h

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