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Start learning 50% faster. Sign in nowLet the total work = 200 units Then, efficiency of ‘A’ = (200/50) = 4 units/hour Work completed by ‘A’ alone in 30 hours = 4 × 30 = 120 units Remaining work = 200 – 120 = 80 units So, efficiency of ‘B’ = 80/20 = 4 units/hour Therefore, combined efficiency of ‘A’ and ‘B’ = 4 + 4 = 8 units/hour So, time taken by ‘A’ and ‘B’ together to complete the work = (200/8) = 25 hours
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