An Aircraft Is Climbing at a 30-Degree Angle to the Horizontal

Multiple Choice

An aircraft is climbing at a 30-degree angle to the horizontal. How fast is the aircraft gaining altitude if its speed is 750 kilometres per hour?

A) 400 kilometres per hour
B) 350 kilometres per hour
C) 375 kilometres per hour
D) 250 kilometres per hour
E) 425 kilometres per hour