CAT Practice : Pipes cisterns, Work time

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Classic Work - Time Question!!

Watering A Garden

    Q.19: Ajay and Suraj can water a garden in 45 minutes and 40 minutes respectively. They started working together but after some time Ajay left to watch a cricket match. Suraj hurriedly finished the work in next 23 minutes and joined Ajay. After how many minutes had Ajay left?
    1. 9 min
    2. 8 min
    3. 7 min
    4. 10 min


  • Correct Answer
    Choice A. 9 min

Detailed Solution

Suraj took 23 minutes to finish the remaining work =

Work finished by Ajay and Suraj together =

Time taken = = 9 mins

Correct Answer: 9 min

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Mathematicians are creatures of habit. This topic has been called Pipes and Cisterns because someone named it like it long ago. Pipes and Tanks would be much better - at least makes it sound like wartime.