Question

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.

558km/h
30
How you get yhe answer
speed=distance/time

Add the total distances up: 2800+1500+1000=5300 km

Solve for time for all parts (remember units)
t=distance/speed
Part A: 2800/700=4 hours
Part B: 1500/500=3 hours
Part C: 1000/400=2.5 hours

Then add all time parts up
4+3+2.5=9.5 hours

Then finally solve for speed total

speed=distance/time
speed=5300 km/9.5 hours
Speed=557.89 km/h


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