Metric Time

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Here's a challenge that uses an unusual clock.

Suppose a Metric Clock uses the following system:

1 day = 10 metric hours

1 metric hour = 10 metric minutes

1 metric minute = 10 metric seconds

1 metric second = 10 metric mini-seconds

What is the time in our system when the Metric Clock registers 4 hours, 5 minutes, 6 seconds and 7 mini-seconds?

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What time is it in our system when the metric clock reads 4 hours, 5 minutes, 6 seconds and 7 mini-seconds? Explain the thinking you used to find your answer.
 
Here's who has answered so far:

Mrs. Fernsler            Jeremy A.

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from Problem of the Week, Lyle Fisher and William Medigovich, Dale Seymour Publications, 1981