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
Answer: Option C
Solution(By Examveda Team)
Water filled by (boy + girl) in one minute, $$\eqalign{ & \frac{4}{3} + \frac{3}{4} = \frac{{16 + 9}}{{12}} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = \frac{{25}}{{12}}\,{\text{liter}} \cr} $$ Hence, time taken to fill 100 liter, $${\text{ = 100}} \times \frac{{12}}{{25}} = 48\,{\text{minutes}}$$Join The Discussion
Comments ( 2 )
Related Questions on Time and Work
A. 18 days
B. 24 days
C. 30 days
D. 40 days
Thanks
how they could say that water filled by (B+G) in ONE minute is 4/3+3/4 as 4/3 or 3/4 both are in lit/min?