Unit test
it takes andrew 720 seconds to take a shower. he spends an additional 420 seconds eating breakfast.
how many minutes does it take andrew to take a shower and eat breakfast?
minutes
[metric reference sheet]
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19 minutes

Step-by-step explanation:

We should know that:  1 minute = 60 seconds

∵ It takes Andrew 720 seconds to take a shower

   converting to minutes ⇒∴ 720 seconds  = 720/60 = 12 minutes

He spends an additional 420 seconds eating breakfast.

converting to minutes ⇒∴ 420 seconds  = 420/60 = 7 minutes

So, The time taken for a shower and eat breakfast = 12 + 7 = 19 minutes