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Fifteen identical robots, each working at the same constant rate, can assemble 50 toys in 8 minutes. How many minutes would it take to 8 such machines to assemble 72 toys?

Fifteen identical robots, each working at the same constant rate, can assemble 50 toys in 8 minutes. How many minutes would it take to 8 such machines to assemble 72 toys? Correct Answer 21.6 

Formula used:

MDH/W = constant

Where M = number of men or machine

D = number of days

H = number of hours or minute

W = Total work 

Calculation:

Let the time required be x

According to the question,

15 × 8/50 = 8 × x/72

⇒ x = 15 × 8 × 72/(50 × 8)

⇒ x = 216/10

∴ Time required = 21.6 minute

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