Steve can paint a room three times as fast as Billy. When they work together, Steve and Billy can paint a large room in 4 hours. How many hours would it take Billy to paint it by himself?

Question

Iris Simon

Mathematics

21 January, 04:28

Steve can paint a room three times as fast as Billy. When they work together, Steve and Billy can paint a large room in 4 hours. How many hours would it take Billy to paint it by himself?

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Answers (1)

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Julianne Anderson · Answer 1

let x be the rate of Steve working, then the rate of Billy will 3x

the whole job be 1

1 / (x+3x) = 4

x = 1/16

3x = 3/16 hr. = > Billy paint by himself