GMAT PREP 2
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IMO: E
Time for entire Trip with same speed = X/60
Time for variable speed = 5/30 + X-5/60 = 5+x/60
Percentage greater is:
x/60 (%) = (5+x)/60
(%) = (5+x)/60 * 60/x
(x%) = 5+x/x -----> this is the total percentage
x% = 5+x/x - 1
5/x
% = 5/x * 100 = 500/x%
Time for entire Trip with same speed = X/60
Time for variable speed = 5/30 + X-5/60 = 5+x/60
Percentage greater is:
x/60 (%) = (5+x)/60
(%) = (5+x)/60 * 60/x
(x%) = 5+x/x -----> this is the total percentage
x% = 5+x/x - 1
5/x
% = 5/x * 100 = 500/x%