Question 1077451
let t be the time taken by flame 
let x be the volume of the container
  it is mentioned that  t is linear function of x
 hence  t= ax+b
 here a , b are constants
  it is given that 
          for x=748 ml, t= 14
  put these values in the above equation
           14=  748 a +b ---------eq(1)
  for x=1100 ml, t= 22 seconds
    22 =  1100a+b ----- eq (2)
 we need to solve eq(1) and eq(2) for a, b
 subtract eq(1) from eq (2)
     22 = 1100 a+ b
     14 =   748 a +b
----------------------------
    8=352 a 
----------------------
   {{{ a  = 8/352 }}}
     put {{{ a=8/352 }}}  in eq(1) 
       {{{ 14 = 748 * 8/352 +b}}}
         {{{ 14 =  17+b}}}
           {{{ 14-17 =b}}}
            {{{ -3 =b}}}
      hence b= -3  and  a= {{{ 8/352}}}
  substitute these values in  t= ax +b
                              {{{ t= 8x/352 -3}}}