Question 1063306
one cyclist: 4x because he went for 4 hours at speed x
the other: 4(x-6) this fellow went 4 hours at x-6
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4x+4(x-6) = 192
4x+4x-24 = 192
8x = 216
x = 216/8 = 27 was the average speed of the fast one
27-6 = 21 was the average speed of the slower cyclist