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People's education edition, the first volume of seventh grade mathematics, chapter 3, the answer to the exercise 3.3 7.
Solution: let the aircraft speed be X km/h when there is no wind.
17
2 hours and 50 minutes =-hour
six
17
——(x+24)=3(x-24)
six
x=840
3 (x-24)
=3(840-24)
=2520-72
=2448
A: When there is no wind, the speed of the plane is 840/ h, and the distance between the two cities is 2448 kilometers.