<PRE><B>Question 1129892</B>
8.5x + 8.5(x + 37.8) = 578
8.5x + 8.5x + 321.38 = 578
17x = 256.7
x = 15.1
.
The bicycle traveled at an average rate of 15.1 mph and the car at an average rate of 52.9 mph (15.1 + 37.8)
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Check:
bike: 8.5 * 15.1 = 128.35
car : 8.5 * 52.9 = 449.65
. . . . . . . . . . -------
. . . . . Total . . :578 Correct</PRE>