Asked by todd
An aeroplane flies at 800km/h for one third of its flight time and averages 700 km/h for the entire trip. What is the average speed, in kilometres per hour, over the remaining part of the journey?
A. 600
B.750
C.650
D.500
E.625
Could you please explain in detail thank you
A. 600
B.750
C.650
D.500
E.625
Could you please explain in detail thank you
Answers
Answered by
Steve
distance=speed*time
So, if it flew at 800km/hr for x hours, then it flew at some unknown speed s for 2x hours:
800x + s*2x = 700*3x
800+2s = 2100
2s = 1300
s = 650
So, if it flew at 800km/hr for x hours, then it flew at some unknown speed s for 2x hours:
800x + s*2x = 700*3x
800+2s = 2100
2s = 1300
s = 650
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