# 3.10.4. Measuring Time

If a girl walks for 6 kilometres in 30 minutes when walking with the same speed consistently, how many kilometres can she walk in 50 minutes?

• A10
• B250
• C5
• D80

### Example

If a girl walks for 6 kilometres in 30 minutes when walking with the same speed consistently, how many kilometres can she walk in 50 minutes?

### Solution

You can divide or multiply the distance and the amount of time by the same amount, and the speed does not change.

Since the girl walks 6 kilometres in 30 minutes, she walks 2 kilometres in 10 minutes (divide each by 3).

Since 10 minutes 5 = 50 minutes, then we can find the distance the girl walks in 50 minutes by multiplying 2 kilometres by 5.

Since , then the girl walks 10 kilometres in 50 minutes.

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