A is 30% more efficient than B. How much time will they, working toge…

Question

A is 30% more efficient than B. How much time will they, working together, take to complete a job which A alone could have done in 23 days?

Accepted Answer

Option B. 13 days. Answer & Solution Answer: Option B Solution: & Ratio\, of\, times\, taken\, by\, A\, and\, B & = 100:130 = 10:13 & Suppose\, B\, takes\,x\, days\, to\, do\, the\, work & Then,10:13::23:x & x = 23 × 1310 & x = 29910 & A's\, 1\, day's\, work = 123 & B's\, 1\, day's\, work = 10299…