Jigsaw Puzzles

Large Jigsaw Puzzle

HELP ME PLEASE (math obviously)!!!!! (:?

1. Rita, Brittany, and Maria can complete a jigsaw puzzle in 1 hour and 30 minutes if they work together. Working alone, it takes Rita 1 less hour to complete The Jigsaw Puzzle than it takes Brittany, and Brittany completes the jigsaw puzzle three times as fast as Maria. How much time would it take each to complete the jigsaw puzzle working alone?

2. A line that a graph gets closer to as the value of a variable becomes extremely large or small. What is this?

(For number 1, can you please tell me what you got for Rita please and for number 2, you have choices: inverse variation, discontinuous function, asymptote, excluded value, direct variation, rational function, rational expression, rational equation, continuous function, and extraneous solution.)
REMEMBER: the final answer is of them working alone not together

Working alone, it takes Rita 1 less hour to complete the jigsaw puzzle than it takes Brittany : R = B – 1 or B = R + 1

Brittany completes the jigsaw puzzle three times as fast as Maria : B = M/3 , the same as M = 3B = 3(R + 1)

1/R + 1/B + 1/M = 1/(time taken by working together)

1/R + 1/(R+1) + 1/[3(R+1)] = 1/(3/2)

[(3R+3) + (3R) + (R)] / [3R(R+1)] = 2/3
3(7R + 3) = 2*3R(R+1)
21R + 9 = 6R^2 + 6R
6R^2 – 15R – 9 = 0
3(R – 3)(2R + 1) = 0

R = 3 hours
B = R + 1 = 4 hours
M = 3B = 12 hours

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