Question 221073
if T is their combined time, then the FRACTION painted by Hannah is T/8 and the FRACTION painted by Miley is T/10
___ the FRACTIONS add to 1 (the WHOLE room)


T/8 + T/10 = 1


multiplying by 40 (LCD) ___ 5T + 4T = 40 ___ 9T = 40 ___ T = 40/9 (about 4.5 hr)