Final answer:
The bullet takes 2.5 seconds to reach maximum height.
Step-by-step explanation:
To find the time it takes for the bullet to reach maximum height, we can use the equation:
t = (v * sin(theta)) / g
where:
- t is the time
 - v is the initial velocity
 - theta is the launch angle
 - and g is the acceleration due to gravity
 
Plugging in the given values, we get:
t = (300 * sin(40)) / 9.8
Simplifying this equation gives us the answer:
t = 2.5 seconds