A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the sun and the Earth in terms of the new unit if light takes $8 \min \text{ and }20 \mathrm{s}$ to cover this distance?

Kamal can build a 6 foot high wall in 24 days and Karan can build the same wall in 22 days. In how many days will they together build the same wall?

(A)$\frac{23}{264}days$

(B)$\frac{246}{23}days$

(C)$\frac{264}{23}days$

(D)$\frac{23}{246}days$

Kamal can build a 6 foot high wall in 7 hours. Abi can build the same wall in 13 hours. If they work together, in what time will the same wall be built?

(A)$\frac{89}{20} hours$

(B)$\frac{20}{91}hours$

(C)$\frac{91}{20}hours$

(D)$\frac{20}{89}hours$

G is twice as fast as S in doing work. If G can do a work in $30$ days less than S, how many days will they take to complete the work together? 

1.$25$
2. $20$
3. $22$
4.$15$