1970 AHSME Problems/Problem 21

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Problem

On an auto trip, the distance read from the instrument panel was $450$ miles. With snow tires on for the return trip over the same route, the reading was $440$ miles. Find, to the nearest hundredth of an inch, the increase in radius of the wheels if the original radius was 15 inches.

$\text{(A) } .33\quad \text{(B) } .34\quad \text{(C) } .35\quad \text{(D) } .38\quad \text{(E) } .66$

Solution

$\fbox{B}$

See also

1970 AHSC (ProblemsAnswer KeyResources)
Preceded by
Problem 20
Followed by
Problem 22
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