Plz help me solve this prob. Answers mismatch

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Pipe A & B can fill a cistern in 15hrs and 10hrs respect. C can empty the full cistern in 30hrs. All 3 taps were open for 2 hrs, when it was remembered that C had been left open. It was then closed. How many hours more would it take for the cister...
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@[610184:coolrr] you are getting right i suppose. i am also getting the same 😃
or
http://www.pagalguy.com/prep/quantitative/

Thanku 😃
https://www.facebook.com/#!/MBA.MybookAdda
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Pipe A & B can fill a cistern in 15hrs and 10hrs respect. C can empty the full cistern in 30hrs. All 3 taps were open for 2 hrs, when it was remembered that C had been left open. It was then closed. How many hours more would it take for the cistern to be filled?
1) 30min
2) 1.2hrs
3) 24min
4) 35min

I am getting 4hrs 24min.
Plz help me getting the right answer.

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