An airplane makes a 400-mile trip against a head wind in 4 hours. the return trip takes 2.5 hours, the wind now being a tall wind. if the plane maintains a constant speed with respect to still air, and the speed of the wind is also constant and does not vary, find the still-air speed of the plane and the speed of the wind.

Step-by-step explanation:

Lets call the the still-air speed of the plane and the speed of the wind. On the first part the speed of the plane relative to the ground will be , and on the second part it will be .

We know that the distance d=400 miles on the first and second parts are the same, so by the definition of velocity we will have:

Or:

Adding both equations:

Which for our values is:

If instead of adding, we substact, we would have:

Which for our values is:

answer: i believe the answer is e

step-by-step explanation:

this excerpt is taken from the book “we shall not be moved : the women’s factory strike of 1909 “ and is written by joan dash. it is the story of the great strike when almost 30thousand women working in factories in america formed a union to fight unsafe working conditions, long working hours and miserable wages.

question: which best states the author’s purpose for including this information in the text?

answer: to challenge the reader’s ideas about a historical event