Can someone plz help me solved this problem I need help plz help me! Will mark you as brainiest!
1 answer:
Answer:
260
20
Step-by-step explanation:
speed of plane= p
speed of wind =w
- (p+w)*3=840
- p+w=840/3=280
and
- (p-w)*3.5=840
- p-w= 840/3.5= 240
added up the 2 equations we get:
then
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