Question
Wed November 23, 2011 By:
 

At t minutes past 2 the time needed by minute hand was found to be 3 minutes less than t²/4 minutes. Find t.

Expert Reply
Wed November 23, 2011
t2/4 - t = 3
 
t2  -4t = 12
 
t2  -4t -12 = 0
 
t2  +2t-6t - 12=0
 
t(t+2)-6(t+2)=0
 
(t+2)(t-6)=0
 
t=-2 or t=6
 
since t is time can not be negative hence t=6 is the answer
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