Question

A and B together can complete a piece of work in 35 days while A alone can complete the same work in 60 days. B alone will be able to complete the same working in

74 days
80 days
84 days
90 days

Answer 1

Answer:

♠ The correct option is C.

Step-by-step explanation:

(A + B)’s one day work = 1/35

A’s one day work = 1/60

B’s one day’s work = (A + B)’s one days work - A’s one day’s work

♦ 1/35 - 1/60 = 1/84

Answer 2

Question :---- we have to find in how many days B alone can complete the whole work ...

Given :-- A+B together can complete it in 35 days.

and A alone can do it in 60 days ....

$\bold{\boxed{\huge{\boxed{\orange{\small{\boxed{\huge{\red{\bold{\:Answer}}}}}}}}}}$

LCM of 35 & 60 = 420 (Let Total work)

Efficiency of A+B & A = 12 unit per day, and 7 unit per day .

so, Efficiency oF B = 12-7 = 5 unit per day .

Time he will take to complete whole work = $\huge{\frac{</strong><strong>4</strong><strong>2</strong><strong>0</strong><strong>}{</strong><strong>5</strong><strong>}}$ = $\large\red{\boxed{\sf </strong><strong>8</strong><strong>4</strong><strong>\</strong><strong>:</strong><strong>days\</strong><strong>:</strong><strong>(</strong><strong>C</strong><strong>)</strong><strong>}}$

(Hope this helps)