You need to make 5 grilled cheese sandwiches. You have a grill that is large enough to toast 2 sandwiches at a time. The sandwiches must be toasted one minute on each side. It takes 3 seconds to flip a sandwich and 5 seconds to take one off or put one on the grill. What is the shortest amount of time needed to toast all five sandwiches?

Question

Mya Johns

Mathematics

23 May, 00:34

You need to make 5 grilled cheese sandwiches. You have a grill that is large enough to toast 2 sandwiches at a time. The sandwiches must be toasted one minute on each side. It takes 3 seconds to flip a sandwich and 5 seconds to take one off or put one on the grill. What is the shortest amount of time needed to toast all five sandwiches?

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Answers (2)

Know the Answer?

Katie Sanders · Answer 1

2 sandwiches -

4 minutes to toast

6 seconds to flip

20 seconds to take off or put on

4 minutes and 26 seconds

4 sandwiches

8 minutes and 52 seconds

last sandwich

2 minutes to toast

3 seconds to flip

10 seconds to take off or put on

2 minutes and 13 seconds

total: 10 minutes 65

11 minutes and 5 seconds

Dario Weiss · Answer 2

Each sandwich is toasted for 2 minutes and it takes 3 seconds to flip it.

The first two sandwiches will be toasted in 2 minutes (toasting) and 6 seconds (flipping).

The two will then be switched which will take 10 seconds.

The next two will again take 2 minutes and 6 seconds.

The final sandwich will take 5 seconds to be placed.

The final sandwich will also take 2 minutes to toast and 3 seconds to flip.

Total time:

2 + 2 + 2 = 6 minutes

6 + 10 + 6 + 3 = 25 seconds

Total time is 6 minutes and 25 seconds.