2 years ago in Time and Work

Subhash can copy 50 pages in 10 hours; Subhash and Prakash together can copy 300 pages in 40 hours. In how much time can Prakash copy 30 pages?

[A] 13 h
[B] 12 h
[C] 11 h
[D] 9 h
[E] 10 h
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