2 years ago in Time and Work

# A cistern can be filled by two pipes in 20 and 30 minutes respectively. Both pipes being opened, when the first pipe must be turned off so that the cistern may be filled in 10 minutes more.

[A] after 10 minutes
[B] after 12 minutes
[C] after 20 minutes
[D] after 8minutes

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## Related Questions

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• [A] Rs. 76
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