किसी काम को P और Q मिलकर 12 दिनों में, Q और R मिलकर 15 दिनों में तथा R और P मिलकर 20 दिनों में समाप्त कर सकते हैं, तो P अकेले कितने दिनों में काम समाप्त करेगा?
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Time taken by P and Q to complete the work = 12 days
Work done by P and Q in 1 day = 1/12 parts
Time taken by Q and R to complete the work = 15 days
Work done by Q and R in 1 day = 1/15 parts Time taken by R and P to complete the work = 20 days
Work done by R and P in 1 day = 1/20 parts
Work done by P alone in 1 day = 1/12 - 1/15 - 1/20
= 5 - 4 - 3/60
= -2/60
= -30
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