Annette drives her car 105 miles and has a mean of a certain speed. if the mean speed had been 4mph more, she could have travele d 119 miles in the same length of time. what was her mean speed?
1 answer:
Let the mean speed be x mi/hr Time taken to travel will be: distance/ speed thus: 105/x=119/(x+4) solving for x we get: 105(x+4)=119x 105x+420=119x 119x-105x=420 x=30 mi/hr Thus the mean speed is 30 mi/hr
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