Answer:
72
Step-by-step explanation:
The pythagorean theorem states that in a right triangle A^2 + B^2 = C^2 where A and B are the two smaller sides and C is the hypotenuse.
Because of this, in this triangle 30^2 + B^2 = 78^2
Which means B^2 = 5184
And B = 72
40 minutes because 1/3 is 20 minutes because an hour is 60 minutes
The answer is B. 6.5f+2.5 because 13/2 is 6.5 and 5/2 is 2.5
