4. A, B and C together can complete a piece of work in 30 min. A and B together can complete the same work in 50 min. C alone can complete the work in (1) 60 min (2) 75 min (3) 80 min (4) 150 min

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4. (2) One min work of ( A, B ) and ( C=frac{1}{30} ) min work of ( A ) and ( B=1 / 50 ) ane min work of ( C ) alone ( =frac{1}{30}-frac{1}{50} ) [ =frac{5-3}{150}=frac{2}{150}=frac{1}{75} ] Hence, ( C ) alone complete that work in 75 min.

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