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Efficiency of (P+R) = (6+4) = 10 Days taken by (P + R) together to complete the work = 6 days Efficiency of (Q + S) = (5+3) = 8 So, Q and S will take time = (Total days of (P + R) × Total Efficiency of (P + R)) / (Total Efficiency of (Q + S)) = (6 ×10)/8 = 60/8 = 7(1/2) days
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If ∆ ABC~∆ FDE such that AB = 9 cm, AC = 11 cm, DF = 16 cm and DE = 12 cm, then the length of BC is: