Exams › SSC CGL (Prelims) › General

A boy and a girl are together filling a tank with water. The boy pours 5 liters every 4 minutes, while the girl pours 4 liters every 5 minutes. How much time will it take to fill 82 liters of water in the tank?

1. 35 min
2. 50 min
3. 45 min
4. 40 min

Correct answer: 40 min

Solution

The boy's rate is \(5/4\) L/min and the girl's rate is \(4/5\) L/min. Their combined rate is \(5/4+4/5=41/20\) L/min. Time to fill 82 liters is \(82\div(41/20)=40\) minutes.

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