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## #1 2017-12-13 04:05:56

**shakeel123****Moderator**- Registered: 2017-09-21
- Posts: 50,796

### John can do certain work in 30 hours. If he and his son work toge...

# General Basic Math Exams Quizzes MCQs Quizzes Time, Distance and Work Math Quiz

**Question:**

John can do certain work in 30 hours. If he and his son work together, the time taken is 20 hours. The son alone can finish the work in:

**Option A):**

30 hours**Option B):**

60 hours**Option C):**

20 hours**Option D):**

50 hours

**Correct Answer is Option B):**

60 hours

**Explanation:****Solution:**

John's one hour's work = 1/30

He and his son's one hour's work = 1/20

Sons's one hour work = 1/20 - 1/30

= 3 -2/60 = 1/60

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## 2017-12-13 04:05:56

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### Re: John can do certain work in 30 hours. If he and his son work toge...

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