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faust18 [17]
2 years ago
13

Can someone plz help me solved this problem I need help plz help me! Will mark you as brainiest!

Mathematics
1 answer:
olya-2409 [2.1K]2 years ago
7 0

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:

  • 2p= 280+240
  • p=260 mph

then

  • w= 20 mph
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