john can dust 2/5 of is house in 45 minutes. what is his rate of dusting per hour?

Question

this question is on my homework and i cant figure it out i need someone really really really really smart

Answer 1

Lisa, I'm only really really really smart, but I'll do my best! Just convert minutes to hours and then form the ratio, and then simplify the compound fraction:

 

(2/5 of a house) per (3/4 of an hour) (because 45 minutes = 45/60 = 3/4 hour)

 

(2/5)/(3/4) = (2/5) x (4/3) = 8/15 house/hour