gerardoblk6190 gerardoblk6190
  • 17-03-2018
  • Mathematics
contestada

Sally can paint a room in 8 hours while it takes steve 7 hours to paint the same room. how long would it take them to paint the room if they worked together?

Respuesta :

Catya
Catya Catya
  • 17-03-2018
rate for Sally is 1 room per 8hrs
rate for Steve is 1 room per 7hrs

combined rate:
1/8 + 1/7 = 1/T
7/56 + 8/56 = 1/T
15/56 = 1/T
56/15 = T
3 11/15 = 3 hrs 44 min
Answer Link

Otras preguntas

A jump rope is shaken producing a wave with a wavelength of 0.5m with the crest of the wave passing a certain point 4 times per second. What is the velocity of
what are two types of scientific investigations
Scientist never say a theory is proven or not they only say if the evidence _____or _____ it
How do you find the derivative of y=arcsin(2x+1)y=arcsin(2x+1)?
How do you find the derivative of y=tan(arcsin(x))y=tan(arcsin(x)) ?
A jump rope is shaken producing a wave with a wavelength of 0.5m with the crest of the wave passing a certain point 4 times per second. What is the velocity of
Solve. 7/8p-1/4=1/2p
Which situation can be represented by the inequality 4x - 25_< 125
Will xenon react to nitrogen and why?
How do you find the derivative of y=arcsin(2x+1)y=arcsin(2x+1)?