Aptitude Notes 1. Time & Work MCQ

Aptitude Notes

1. Time & Work 

( MCQ - 1 to 4)

Question  : 1

A and B complete a work in 6 days. A alone can do it in 10 days. If both together can do the work in how many days?

A. 3.75 days

B. 4 days

C. 5 days

D. 6 days

Answer : A. 3.75 days

Explanation:

1/6 + 1/10 = 8/30 = 4/15, 

15/4 = 3.75 days


Question  : 2

A  B together can do a piece of work in 8 days. If A alone can do the same work in 12 days, then B alone can do the same work in?

A. 20 days

B. 16 days

C. 24 days

D. 28 days

Answer : C. 24 days

Explanation:

B = 1/8 – 1/2 = 1/24 => 24 days


Question  : 3

A can do a piece of work in 4 days. B can do it in 5 days. With the assistance of C they completed the work in 2 days. Find in how many days can C alone do it?

A. 10 days

B. 20 days

C. 5 days

D. 4 days

Answer : B. 20 days

Explanation:

C = 1/2 - 1/4 - 1/5 

= 1/20 => 20 days

Question  : 4

A and B can do a piece of work in 6 2/3 days and 5 days respectively. They work together for 2 days and then A leaves. In how many days after that B will complete the work alone.

A.2 days

B. 1 ½ days

C. 3 days

D. 3½ days

Answer : B. 1 ½ days

Explanation:

3/20 * 2 + (2 + x)/5 

= 1, x = 1 ½ days


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