Question

A and B working together complete a work in 35 days. If A takes 60 days to complete it, how long would B alone tale to complete

a) 64 days
b) 72 days
c) 81 days
d) 84 days
plz ......I will surely follow you, if you answer with explanation.​

Answer 1

Efficiency (Work done per day) for :

( ˘ ³˘)/

A & B together = 1/35th

A alone = 1/60th

Thus, efficiency of B alone = Total - A’s efficiency

Explanation:

OR Efficiency of B alone = (1/35) - (1/60) = 6/210 - 3.5/210 = 2.5/210 = 1/84th

Hence, since B completes 1/84th work daily, he would take 84 days to complete the work alone.