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OpenStudy (vshiroky):
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OpenStudy (vshiroky):
OpenStudy (anonymous):
against the wind wind will oppose plane and reduce its speed so effective speed=plane speed-wind speed=280/(1+10/60)=280*6/7=240mph
OpenStudy (anonymous):
in direction of wind wind will support plane and will inc its speed so effective speed=plane + wind speed=280/(50/60)=280*6/5=336mph plane-wind=240 .............(1) plane+wind=336 ...(2) add (1) & (2) 2*plane=336+240=576 plane=576/2=288mph wind=288-240=48mph
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