Jack and Jill can mow the lawn together and finish in 40mins. If Jill can mow twice as fast than Jack, then…

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Jack and Jill can mow the lawn together and finish in 40mins. If Jill can mow twice as fast than Jack, then…

[From: ] [author: ] [Date: 12-08-27] [Hit: ]

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How fast can Jack mow the lawn by himself?

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r1 = jill's rate of work [in lawns/minute]
r2 = jack's rate of work [in lawns/minute]

(r1 + r2) * 40 minutes = 1 lawn.

r1 = 2 r2

3 r2 * 40 minutes = 1 lawn
r2 = 1 lawn / 120 minutes
r1 = 1 lawn / 60 minutes

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120 Mins

Jack did 1/3 in 40mins so 40 plus 40 plus 40 :)

1

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