A10. How high is a seesaw ladder in the shape of the letter A if each leg is $2.5 \mathrm{~m}$ long and the maximum distance between the legs is $1.4 \mathrm{~m}$?
(A) $2.0 \mathrm{~m}$
(B) $2.1 \mathrm{~m}$
(C) $2.2 \mathrm{~m}$
(D) $2.3 \mathrm{~m}$
(E) $2.4 \mathrm{~m}$

# Sixth Regional Mathematics Knowledge Competition for Students of Vocational Schools

March 29, 2006

## II. part: LONGER PROBLEMS

Instruction: Solve problems B1 to B4 of the second part on the attached paper, where you write down the entire calculations. Carefully read each problem and answer the questions asked. The solution to each of these problems will be rated from 0 to 5 points.

Note that you need to solve the problems of the first and second parts within 90 minutes.
A10. The height $v=\sqrt{2.5^{2}-0.7^{2}}=2.4 \mathrm{~m}$.

## II. PART