Answer:
-11.5
Step-by-step explanation:

Answer:
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Step-by-step explanation:
somnkeunmaonuhbsib m isbniakks jjshkwhbsj iksne
ajbsubks8 laibsyjs obsujbsk isgis8j s osjins kksuusb kbsuajoao. kwunkaohw iwhjnwkbjsjsjkwjnao oshjsklsuns
The speed of wind and speed of plane in still air are 23 and 135
km/h respectively.
<u>Step-by-step explanation:</u>
Let the speed of wind and speed of plane in still air are w and p km/h respectively.
The effective speed on onward journey was
................(1)
The effective speed on return journey was
..............(2)
Adding equation (1) and equation (2) we get,
⇒ 
⇒ 
⇒ 
Putting value of
in
we get:
⇒ 
⇒ 
⇒ 
Therefore ,The speed of wind and speed of plane in still air are 23 and 135
km/h respectively.
Answer:
1.71
Step-by-step explanation:
by using definition of cos

Answer:
0.3
Step-by-step explanation:
just subtract