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A machine can manufacture 20 cans per hour, and exactly 10 s

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sandy

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Joined: 07 Jun 2014

Posts: 4804

GRE 1: Q167 V156

WE:Business Development (Energy and Utilities)

A machine can manufacture 20 cans per hour, and exactly 10 s [#permalink]

17 Aug 2018, 18:50

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12% (01:26) wrong

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A machine can manufacture 20 cans per hour, and exactly 10 such cans fit into every box. Maria packs cans in boxes at a constant rate of 3 boxes per hour. If the machine ran for 2 hours and was then turned off before Maria started packing the cans in boxes, how many minutes would it take Maria to pack all the cans that the machine had made?

(A) 40
(B) 45
(C) 80
(D) 160
(E) 800

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amorphous

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Joined: 07 Jan 2018

Posts: 730

Re: A machine can manufacture 20 cans per hour, and exactly 10 s [#permalink]

18 Aug 2018, 00:19

machine manufactures at the rate of 20 cans per hr
In 2 hr machine m/f 40 cans

3 boxes = 30 cans.
There are total 40 cans to be packed

rate of maria = 30 cans per hr.

For 40 cans total time taken by maria = $\frac{40}{30}$ hr = 80 mins
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