Suppose Pat charges P hours, Kate K hours and Mark M hours
P+K+M = 162 ----(1)
Question says P = 2K => K = P/2 ---- (2)
and P= M/3 => M = 3P---- (3)
Solve, eq 1, 2 and 3 to get P = 36
Hence, K = 18 (from eq 2) and M = 108 (from eq 3)
M-K = 108-18 = 90
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