As the headwind comes at the head of the plane, therefore 50 mph headwind slows the plane down.
Thus actual speed of plane with headwind, 
Now using the formula , 



Hence plane will take time to complete the distance 1250 mile in 2.5 hours
gravity is the force on the object directed down the plane
BY THINKING AND USING PHISYCS
Answer: The boiling point of solution is 
Explanation:
Elevation in boiling point:
where,
= boiling point of solution = ?
= boiling point of toluene =
= boiling point constant of toluene =
m = molality
i = Van't Hoff factor = 1 (for non-electrolyte)
= mass of solute
= 7.94 g
= mass of solvent (toluene) = 69.2 g
= molar mass of solute
= 254g/mol
Now put all the given values in the above formula, we get:
Therefore, the boiling point (in °C) of a solution is 112.16
No, you would aim slightly above, because when you throw the spear and it travels through the air it will fall slightly downwards by the time it reaches the fish.