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Best Answer

Distance = Rate * Time

or, for our purpose

Time = Distance/Rate

at 50 mph

Time = 4.5 miles/50 mph

= 0.09 hours = 5.4 minutes

-----------------------------

at 40 mph

Time = 4.5 miles/40 mph

= 0.1125 hours = 6.75 minutes

----------------------------------------------------

6.75 - 5.4

= 1.35 minutes saved

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Q: How much time will you save by traveling 4.5 miles at 50 mph instead of 40 mph?
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