there are two clocks? one becomes late by 2 mins every hour, the other becomes 1 min fast every
hour. After exactly how many hours will they be 1 hour difeerent?(Ans.20 hours)

• In 1 hour , the time diff between two clocks = 2+1= 3 mins
  
  sp 1 hr (or 60 mins ) time difference will occur after 60/3 = 20 hrs
• 13 years agoHelpfull: Yes(2) No(0)
• Ans. 20 hours
  
  Let after x hours they will be 1 hour different
  After x hours first clock will be back by 2x minutes
  After x hours second clock will be ahead by x minutes
  So after x hours they will differ by 2x+x= 3x minutes
  3x = 60 => x =20
• 13 years agoHelpfull: Yes(0) No(1)