Question 891367
Those questions do not seem to be the best ones to answer.


The burn time would be {{{height/rate}}}.


CANDLE__________HEIGHT_________RATE(cm/hour)_____TIME(hours)
Red_____________30 cm__________5.5_______________5.46
White___________19 cm__________3.3_______________5.76


Obviously the white, shorter but thicker candle will burn longer.  How much longer is {{{0.76-0.46=highlight(0.30)}}} hours longer.  About 18 minutes.


Questions in part b are vert poor value.