At what time between 9' O clock and 10' O clock will the hands of a clock point in the opposite directions?

a. 2 2/11 minutes past 10' O clock
b. 16 4/11 minutes past 9
c. 2 2/11 minutes past 9
d. 16 4/11 minutes past 10' O clock

• the correct ans is b. 16 4/11 minutes past 9
  
• 8 years agoHelpfull: Yes(11) No(1)
• At 9 o'clock, the hands of the watch are 45 min. spaces apart.
  
  To be in opposite directions, they must be 30 min. spaces apart.
  
  Minute hand will have to gain 75 min. spaces.
  75 min means 60 min + 15 min means after 10'o clock
  
  55 min. spaces are gained in 60 min.
  
  15 min. spaces are gained in ( ( 60 * 15) /55 )
  Required time = (16 4/11) min. past 10.
  
  
• 8 years agoHelpfull: Yes(4) No(6)
• hands are opposite,angle=180deg
  wkt,
  angle=30(h)-11/2(min)
  => 180=30(9)-11/2(min)
  => 180-270=11/2(min)
  => (180*2)/11=min
  => min=16 4/11 min
• 8 years agoHelpfull: Yes(2) No(4)
• Option D 16 4/11 is the ans
• 8 years agoHelpfull: Yes(1) No(9)
• tell me correct solution..
  
• 8 years agoHelpfull: Yes(1) No(1)
• b,a=2/11[9*30-180]
  =180/11
  =16 4/11
• 8 years agoHelpfull: Yes(0) No(0)
• 16 4/11 past 9 'o clock
• 8 years agoHelpfull: Yes(0) No(0)