Arihant Expert Team Solutions for Exercise 1: Practice Questions

Two pipes A and B can fill a tank in $20 min$and $30 min$, respectively. If both pipes are opened together, the time taken to fill the tank is_____.

$8 men$ can paint a house in $5 days$. How many men will be required to paint the same house in $4 days$?

$A$ and $B$ together can do a work in $15$ days. $B$ alone can do the same work in$60$ days, then, the time taken by $A$ alone to do the work (in days) is _____ .

$45 men$can complete a work in $16 days$. Four $days$ after they started working, $36$more men joined them. How many days will they now take to complete the remaining work?

Some persons can do a piece of work in $12 days$. Two times the number of such persons will do half of the work in _____ .

A can do $\frac{1}{6}$of a work in $5 days$ and B can do$\frac{2}{5}$ of the work in $8 days$. In how many $days$, can both A and B together do the work?

A, B and C individually can do a work in $10 days$, $12 days$ and $15 days$, respectively. If they start working together, then the number of $days$ required to finish the work is _____ .

Working $8 hour$ a day, Anu can copy a book in $18 days$. How many hours a day should she work so as to finish the work in $12 days$?