Exams

 Draw BE // CD

Then, CE = AB = 1.6 m,

BE = AC =

 $$\begin{gathered} DEtan30 \\ => DE = tan30 x 203 \\ => DE = 13x203 = 20 \end{gathered}$$

Therefore, CD = CE + DE = (1.6 + 20) m = 21.6 m.

ratio = a22a2

C alone can finish the work in 40 days.
As given C does half as much work as A and B together
=> (A + B) can do it in 20 days
(A + B)s 1 days wok = 1/20.
A's 1 days work : B's 1 days Work = 1/2 : 1 = 1:2(given)
A's 1 day’s work = (1/20) x (1/3) = (1/60) [Divide 1/20 in the raio 1:2]
B's 1 days work = (1/20) x (2/3) = 1/30
(A+B+C)'s 1 day's work = (1/60) + (1/30) + (1/40) = 9/120 = 3/40

All the three together will finish it in 40/3 = 13 and 1/3 days.

1/8 - 1/x = 1/10

 => x = 40 hrs

List of fundamental duties of the citizens of India in Article 51A of the Indian Constitution :

1. to abide by the constitution and respect its ideal and institutions;

2. to cherish and follow the noble ideals which inspired our national struggle for freedom;

3. to uphold and protect the sovereignty, unity and integrity of India;

4. to defend the country and render national service when called upon to do so;

5. to promote harmony and the spirit of common brotherhood amongst all the people of India   transcending religious, linguistic and regional diversities, to renounce practices derogatory to the   dignity of women;

6. to value and preserve the rich heritage of our composite culture;

7. to protect and improve the natural environment including forests, lakes, rivers, and wild-life       and to have compassion for living creatures;

8. to develop the scientific temper, humanism and the spirit of inquiry and reform;

9. to safeguard public property and to abjure violence;

10. to strive towards excellence in all spheres of individual and collective activity

11. who is a parent or guardian , to provide opportunities for education to his child, or as the case may be, ward between the age of six and fourteen years.