i need help with this math problem

Question

it takes 2/3 of an hour to paint 2/5 of a room How long did it take to paint one room

Answer 1

2/5 room x 5/2 = 1 room in 2/3 hr. x 5/2 = 5/3 hour

= 1 2/3 hours = 1 hour and 40 minutes to paint one room at the same speed