Three men - Prakash, Qasim and Roger - working together, complete a job in 5 hours less than the time taken by Prakash alone, in 1 hour less than the time taken by Qasim alone, and in one-third the time taken by Roger working aloneThe time taken (in minutes) by Prakash and Qasim to finish the work together is
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1 hour 30 minutes.
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