Question

A roast requires 3 hours and 40 minutes in the oven to be cooked. In order to have the roast ready

to serve at 6:30 PM, it must be put into the oven at

Answer 1

2:50 PM

Explanation:

Step 1: State what is given

Roast takes 3 hours and 40 minutes or 220 minutes

Need the roast to be done by 6:30 PM

Step 2: Subtract 3 hours from 6:30

6:30 - 3:00

3:30 PM

Step 3: Subtract 40 minutes from 3:30

3:30 - 40

2:50 PM

Therefore the roast needs to be put into the oven at 2:50 PM