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Bernadette drove 120 miles. The first part of the trip she averaged 60 mph, but on the second part of the trip she ran into some congestion and averaged 48 mph. If the total driving time was 2.2 hours, how much time did she spend at 60 mph?

Dist 1st leg             Dist 2nd leg

60t

48(2.2 – t)

Total dist. 120 miles

60t +48(2.2 – t) = 120

60t + 105.6 – 48t = 120

12t = 14.4

t = 1.2 hours at 60mph

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