Problema Solution
sally can paint a room in 3 hours while it takes steve 7 hours to paint the same room. how long would it take them to paint the room together?
Answer provided by our tutors
the rate of Sally is 1/3 rooms per hour
the rate of Steve is 1/7 rooms per hour
lets x = the hours they need to paint the room together this the together rate is 1/x rooms per hour
1/3 + 1/7 = 1/x
by solving we find
x = 2.1 hr
x = 2 hr 6 min
click here to see the step by step solution of the equation
the need 2 hours and 6 minutes to paint the room together.