What is the length of a piece of safety fuse needed for a burn time of 90 seconds?

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Multiple Choice

What is the length of a piece of safety fuse needed for a burn time of 90 seconds?

Explanation:
The key idea is to match burn time with fuse length using the burn rate. To get a fuse that burns for a specific time, multiply how fast it burns by how long you want it to burn. In this context, the fuse burns at 0.3 inches per second. For a burn time of 90 seconds, the needed length is 90 × 0.3 = 27 inches, which is 2.25 feet. So the correct length is 2.25 feet. If your fuse has a different burn rate, you’d use the same formula with that rate and convert units as needed.

The key idea is to match burn time with fuse length using the burn rate. To get a fuse that burns for a specific time, multiply how fast it burns by how long you want it to burn. In this context, the fuse burns at 0.3 inches per second. For a burn time of 90 seconds, the needed length is 90 × 0.3 = 27 inches, which is 2.25 feet. So the correct length is 2.25 feet. If your fuse has a different burn rate, you’d use the same formula with that rate and convert units as needed.

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