A class starts at 10 a.m. and lasts till 1.27 p.m. Four periods are held during this interval. After every period, 5 minutes are given free to the students. The exact duration of each period is :

a. 42 minutes
b. 48 minutes
c. 51 minutes
d. 53 minutes

• total time between 10am and 1:27pm = 3hr 27min =207min
  let duration of each period be x
  no of breaks = 3 times (since 4 periods are there)
  207-4x-3*15=0
  =>x=48 mins
  
• 11 years agoHelpfull: Yes(1) No(3)
• 48 3 break so 3*5=15 min
  3*60+27=207-15=192/4=48
  
• 7 years agoHelpfull: Yes(0) No(0)