We only need the original 45mph from the first part of the question to tell us our original speed. So, when you reduce your speed by 15mph you get

45mph – 15 mph = 30mph

The next part I would do as a ratio because it is simpler that way.

1. Change 1hr to 60 min

2. Compare 30mi/60min –>this is your rate or speed — to

3. Miles driven, 4mi.

Your ratio will look like:

30 mi/ 60 min = 4mi/ x min

1. Cross multiply

30mi * x min = 60min *4mi

2. 30x = 240 — some teachers want the units, some don’t

3. Divide both sides by 30 and …

x = 8min

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