A plane flies directly from city A to city B, which are separated ...

[lbcchick]

A plane flies directly from city A to city B, which are separated by 2300 mi. From A to B, the plane flies into a 65 mi/h headwind. On the return trip from B to A, the wind velocity is unchanged.
 
  The trip from B to A takes less than the trip from A to B. What is the airspeed (assumed constant) of the plane relative to the air (that is, the airspeed)?
  A) 530 mi/h B) 610 mi/h C) 480 mi/h D) 400 mi/h

Question 2

In which of the following processes does the system's rest mass change?
 
  A) An automobile speeds up.
  B) A rubber ball is squeezed.
  C) The rest mass changes in both of the above processes.
  D) The rest mass changes in neither of the above processes.

[LVPMS]

Answer to Question 1

A

Answer to Question 2

B

[lbcchick]

Thanks for the timely response, appreciate it

[laurnthompson]

Gracias!