A) 10 days
B) 15 days
C) 20 days
D) 25 days
Correct Answer: C
Solution :
Ratio of efficiency = 2 : 1 (A : B) Ratio of required time \[=1:2(A:B)\Rightarrow \,x:2x\] But \[2x-x=30\] \[\Rightarrow \] \[x=30\] and \[2x=60\] Now, efficiency of A = 3. 33% And efficiency of B = 1.66% Combined efficiency of A and B together = 5% So, time required by A and B working together to finish the work \[=\frac{100}{5}=20\] daysYou need to login to perform this action.
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