A) 12 h
B) \[13\frac{1}{2}\]h
C) 15 h
D) 21 h
Correct Answer: A
Solution :
Pan filled in \[110\,\,\text{h}=\frac{1}{10}\left[ \frac{1}{15}+\frac{1}{20}-\frac{1}{25} \right]=\frac{35}{30}\] Remaining part \[=\left[ 1-\frac{23}{30} \right]=\frac{7}{30}\] \[\left[ \frac{1}{15}+\frac{1}{20} \right]\]part is filled by P and Q in 1 h \[\frac{7}{30}\]part will be filled by them in\[\left[ \frac{60}{7}\times \frac{7}{30} \right]=2\,\,h\] \[\therefore \]Total time taken = (10 +2) = 12 hYou need to login to perform this action.
You will be redirected in
3 sec