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### Primary 6 Problem Sums/Word Problems - Try FREE

- Fractions: As easy as ABC! > Fractions Exercise 16 > 3
- Attempting as Guest
- Attempt Mode: Attempt Single Question

**Score :**

(Single Attempt)

**Question
**

John can erect a 100-metre fence in 2 hours.

Tom can erect a 100-metre fence in 4 hours.

Dominic can erect a 100-metre fence in 5 hours.

If all of them work together, how long will it take them to erect a 100-metre fence?

*Note to students:*

*If your answer to the above is a mixed number, give your answer as a b/c*

The correct answer is :

**1`1/19`**