‘A’ alone can complete a work in 40 hours. ‘A’ started the work alone and left after working on it for 20 hours. If ‘B’ completed the rest of the work in 20 hours then find the time taken by ‘A’ and ‘B’ together to complete the whole work.
Let the total work = 300 units Then, efficiency of ‘A’ = (300/40) = 7.5 units/hour Work completed by ‘A’ alone in 20 hours = 7.5 × 20 = 150 units Remaining work = 300 – 150 = 150 units So, efficiency of ‘B’ = 150/20 = 7.5 units/hour Therefore, combined efficiency of ‘A’ and ‘B’ = 7.5 + 7.5 = 15 units/hour So, time taken by ‘A’ and ‘B’ together to complete the work = (300/15) = 20 hours
Six friends P, Q, R , S, T and U are sitting in a row facing East. 'R' is between 'P' and 'T'. 'Q' is just to the right of 'T' but left of 'S'. 'U' is n...
Six persons sit around the circular table facing towards the center. H sits immediate right of E. D sits second to the left of B. G and F are adjacent ...
Who among the following person sits third to the left of the one who sits second to the right of the one who likes Vanilla?
Which of the following statement is/are true?
I. H faces the one who sits just left of J
II. K sits exactly between E and G
III. On...
Who among the following likes G?
What is the position of P with respect to her sister?
Who sits opposite to F?
Who is the spouse of A?
Which of the following statement(s) is/are false?
I. Only one person sits between P and the one who likes Blueberry when counted left of P.
<...Who among the following sits third to the right of O?