**Q: A works thrice as fast as B. If B can complete a work in 18 days. Then number of days taken by A and B working together to complete this work is**

**(a) :**8 days

**(b) :**9 days

**(c) :**5 days

**(d) :**4.5 days

**(e) :**none

Answer:

Explanation:

*4.5 days*Explanation: