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It takes Darline 12 minutes to drive to work in light traffic. To come home, when there is heavy traffic, it takes her 27 minutes. Her speed in light traffic is 35 miles per hour faster than her speed in heavy traffic. Find her speed, in miles per hour, in light traffic and in heavy traffic.

 Feb 10, 2022
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Let her speed in heavy traffic==S

Her speed in light traffic ==S  +  35

 

[S  +  35] * 12 /60 ==S * 27/60, solve for S

 

S ==28 mph - her speed in heavy traffic.

28  +  35 ==63 mph - her speed in light traffic.

 Feb 10, 2022

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