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

physics  Anonymous, Sunday, September 18, 2016 at 7:25pm
30

physics  Lucy, Saturday, October 1, 2016 at 10:46pm
How you get yhe answer
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