In a fraternity with 34 members , 18 take mathematics, 5 take both mathematics and physics and 8 take neither mathematics nor physics. how many take physics hit not mathematics?

34 total members
5 take both math and physics
so, (18 - 5) = 13take only math...
x take only physics
8 take neither

34 - 8 = 26 take math,physics, and both
13 + 5 + x = 26
18 + x = 26
x  = 26 - 18
x = 8

check...
both = 5
neither = 8
math = 13
physics = 8
added = 34

so only 8 take physics but not math

The answer is 225 miles per 4.5 hours. hope this ; )