Practice | Hashtable

Home > Practice > Arithmetic Aptitude > Time and Work > Miscellaneous

1. A boy and a girl together fill a cistern with water. The boy pours 4 liters of water every 3 minutes and girl pours 3 litres every 4 minutes. How much time will it take to fill 100 litres of water in the cistern?

A. 36 minute

B. 42 minutes

C. 48 minutes

D. 44 minutes

Solution:

Water filled by (boy + girl) in one minute,

\begin{aligned} \frac{4}{3} + \frac{3}{4} = \frac{16 + 9}{12} \\ = \frac{25}{12} liter \end{aligned}

Hence, time taken to fill 100 liter,

= 100 \times \frac{12}{25} = 48 minutes

You must login to add comments. Login now.